Add small fixes for 'podman run' from diffing inspect

To try and identify differences between Podman v1.9 and master,
I ran a series of `podman run` commands with various flags
through each, then inspecting the resulting containers and diffed
the inspect JSON between each. This identified a number of issues
which are fixed in this PR.

In order of discovery:
- Podman v2 gave short names for images, where Podman v1 gave the
  fully-qualified name. Simple enough fix (get image tags and use
  the first one if they're available)
- The --restart flag was not being parsed correctly when a number
  of retries was specified. Parsing has been corrected.
- The -m flag was not setting the swap limit (simple fix to set
  swap in that case if it's not explicitly set by the user)
- The --cpus flag was completely nonfunctional (wired in its
  logic)

Tests have been added for all of these to catch future
regressions.

Signed-off-by: Matthew Heon <matthew.heon@pm.me>

pkg/specgen/specgen.go

@@ -140,10 +140,6 @@ type ContainerStorageConfig struct {
 	// Conflicts with Rootfs.
 	// At least one of Image or Rootfs must be specified.
 	Image string `json:"image"`
-	// RawImageName is the unprocessed and not-normalized user-specified image
-	// name.  One use case for having this data at hand are auto-updates where
-	// the _exact_ user input is needed in order to look-up the correct image.
-	RawImageName string `json:"raw_image_name,omitempty"`
 	// Rootfs is the path to a directory that will be used as the
 	// container's root filesystem. No modification will be made to the
 	// directory, it will be directly mounted into the container as root.