Refactor podman to use c/common/pkg/report

All formatting for containers stack moved into one package
The does not correct issue with headers when using custom tables

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

vendor/github.com/containers/common/pkg/report/validate.go

@@ -0,0 +1,13 @@
+package report
+
+import "regexp"
+
+var jsonRegex = regexp.MustCompile(`^\s*(json|{{\s*json\s*(\.)?\s*}})\s*$`)
+
+// JSONFormat test CLI --format string to be a JSON request
+// if report.IsJSON(cmd.Flag("format").Value.String()) {
+//   ... process JSON and output
+// }
+func IsJSON(s string) bool {
+	return jsonRegex.MatchString(s)
+}