e2e tests: SkipIfRemote(): add a reason

Now that Dan has added helpful comments to each SkipIfRemote,
let's take the next step and include those messages in the
Skip() output so someone viewing test results can easily
see if a remote test is skipped for a real reason or for
a FIXME.

This commit is the result of a simple:

   perl -pi -e 's;(SkipIfRemote)\(\)(\s+//\s+(.*))?;$1("$3");' *.go

in the test/e2e directory, with a few minor (manual) changes
in wording.

Signed-off-by: Ed Santiago <santiago@redhat.com>

test/e2e/run_entrypoint_test.go

@@ -90,7 +90,7 @@ ENTRYPOINT ["grep", "Alpine", "/etc/os-release"]
 	})
 
 	It("podman run user entrypoint overrides image entrypoint and image cmd", func() {
-		SkipIfRemote() // FIXME This should work on podman-remote
+		SkipIfRemote("FIXME This should work on podman-remote")
 		dockerfile := `FROM docker.io/library/alpine:latest
 CMD ["-i"]
 ENTRYPOINT ["grep", "Alpine", "/etc/os-release"]