Properly handle podman run --pull command

Currently the --pull missing|always|never is ignored

This PR implements this for local API.  For remote we
need to default to pullpolicy specified in the containers.conf
file.

Also fixed an issue when images were matching other images names
based on prefix, causing images to always be pulled.

I had named an image myfedora and when ever I pulled fedora, the system
thought that it there were two images named fedora since it was checking
for the name fedora as well as the prefix fedora.  I changed it to check
for fedora and the prefix /fedora, to prefent failures like I had.

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

libpod/image/utils.go

@@ -33,7 +33,7 @@ func findImageInRepotags(search imageParts, images []*Image) (*storage.Image, er
 				continue
 			}
 			// account for registry:/somedir/image
-			if strings.HasSuffix(dName, searchName) && dSuspiciousTagValueForSearch == searchSuspiciousTagValueForSearch {
+			if strings.HasSuffix(dName, "/"+searchName) && dSuspiciousTagValueForSearch == searchSuspiciousTagValueForSearch {
 				results = append(results, image.image)
 				continue
 			}