Break up python APIv2 tests

* Tests broken up into areas of concern
* Introduced fixtures to reduce duplicated code
* Introduced new assert methods with APITestCase
* General cleanup of code while visiting
* Tests now targeting quay.io

Known issues:
* is-official against quay.io not working

Fixes: #9238
Signed-off-by: Jhon Honce <jhonce@redhat.com>

test/apiv2/python/rest_api/fixtures/podman.py

@@ -0,0 +1,136 @@
+import configparser
+import json
+import os
+import shutil
+import subprocess
+import sys
+import tempfile
+
+
+class Podman:
+    """
+    Instances hold the configuration and setup for running podman commands
+    """
+
+    def __init__(self):
+        """Initialize a Podman instance with global options"""
+        binary = os.getenv("PODMAN", "bin/podman")
+        self.cmd = [binary, "--storage-driver=vfs"]
+
+        cgroupfs = os.getenv("CGROUP_MANAGER", "systemd")
+        self.cmd.append(f"--cgroup-manager={cgroupfs}")
+
+        if os.getenv("DEBUG"):
+            self.cmd.append("--log-level=debug")
+            self.cmd.append("--syslog=true")
+
+        self.anchor_directory = tempfile.mkdtemp(prefix="podman_restapi_")
+        self.cmd.append("--root=" + os.path.join(self.anchor_directory, "crio"))
+        self.cmd.append("--runroot=" + os.path.join(self.anchor_directory, "crio-run"))
+
+        os.environ["CONTAINERS_REGISTRIES_CONF"] = os.path.join(
+            self.anchor_directory, "registry.conf"
+        )
+        p = configparser.ConfigParser()
+        p.read_dict(
+            {
+                "registries.search": {"registries": "['quay.io']"},
+                "registries.insecure": {"registries": "[]"},
+                "registries.block": {"registries": "[]"},
+            }
+        )
+        with open(os.environ["CONTAINERS_REGISTRIES_CONF"], "w") as w:
+            p.write(w)
+
+        os.environ["CNI_CONFIG_PATH"] = os.path.join(self.anchor_directory, "cni", "net.d")
+        os.makedirs(os.environ["CNI_CONFIG_PATH"], exist_ok=True)
+        self.cmd.append("--cni-config-dir=" + os.environ["CNI_CONFIG_PATH"])
+        cni_cfg = os.path.join(os.environ["CNI_CONFIG_PATH"], "87-podman-bridge.conflist")
+        # json decoded and encoded to ensure legal json
+        buf = json.loads(
+            """
+            {
+              "cniVersion": "0.3.0",
+              "name": "podman",
+              "plugins": [{
+                  "type": "bridge",
+                  "bridge": "cni0",
+                  "isGateway": true,
+                  "ipMasq": true,
+                  "ipam": {
+                    "type": "host-local",
+                    "subnet": "10.88.0.0/16",
+                    "routes": [{
+                      "dst": "0.0.0.0/0"
+                    }]
+                  }
+                },
+                {
+                  "type": "portmap",
+                  "capabilities": {
+                    "portMappings": true
+                  }
+                }
+              ]
+            }
+            """
+        )
+        with open(cni_cfg, "w") as w:
+            json.dump(buf, w)
+
+    def open(self, command, *args, **kwargs):
+        """Podman initialized instance to run a given command
+
+        :param self: Podman instance
+        :param command: podman sub-command to run
+        :param args: arguments and options for command
+        :param kwargs: See subprocess.Popen() for shell keyword
+        :return: subprocess.Popen() instance configured to run podman instance
+        """
+        cmd = self.cmd.copy()
+        cmd.append(command)
+        cmd.extend(args)
+
+        shell = kwargs.get("shell", False)
+
+        return subprocess.Popen(
+            cmd,
+            shell=shell,
+            stdin=subprocess.DEVNULL,
+            stdout=subprocess.DEVNULL,
+            stderr=subprocess.DEVNULL,
+        )
+
+    def run(self, command, *args, **kwargs):
+        """Run given podman command
+
+        :param self: Podman instance
+        :param command: podman sub-command to run
+        :param args: arguments and options for command
+        :param kwargs: See subprocess.Popen() for shell and check keywords
+        :return: subprocess.Popen() instance configured to run podman instance
+        """
+        cmd = self.cmd.copy()
+        cmd.append(command)
+        cmd.extend(args)
+
+        check = kwargs.get("check", False)
+        shell = kwargs.get("shell", False)
+
+        try:
+            return subprocess.run(
+                cmd,
+                shell=shell,
+                check=check,
+                stdout=subprocess.PIPE,
+                stderr=subprocess.PIPE,
+            )
+        except subprocess.CalledProcessError as e:
+            if e.stdout:
+                sys.stdout.write("\nRun Stdout:\n" + e.stdout.decode("utf-8"))
+            if e.stderr:
+                sys.stderr.write("\nRun Stderr:\n" + e.stderr.decode("utf-8"))
+            raise
+
+    def tear_down(self):
+        shutil.rmtree(self.anchor_directory, ignore_errors=True)