System tests: tighten 'is' operator

Fix day-one sloppiness: when I first wrote this framework
it compared strings using 'expr', not '=', to be more
forgiving of extra cruft in output. This was a bad decision.
It means that warnings or additional text are ignored:

    is "all is ok, NOT!"  "all is ok"  <-- this would pass

Solution: tighten up the 'is' check. Use '=' (direct
compare) first. If it fails, look for wild cards ('*')
or character classes ('[') in the expect string. If
so, and only then, use 'expr'. And, thanks to a clever
suggestion from Luap99, include '(using expr)' in the
error message when we do so; this could make it easier
for a developer to understand a string mismatch.

This change exposes a lot of instances in which we weren't
doing proper comparisons. Fix those. Thankfully, there
weren't as many as I'd feared.

Also, and completely unrelated, add '-T' flag to bats
helper, for showing timing results. (I will open this
as a separate PR if requested. I too find it offensive
to jumble together unrelated commits.)

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

hack/bats

@@ -19,6 +19,8 @@ $0 is a wrapper for invoking podman system tests.
                   version of bats installed, runs with '--filter pattern'
                   which runs only subtests that match 'pattern'
 
+   -T             Passed on to bats, which will then show timing data
+
    --help         display usage message
 
 By default, tests ./bin/podman. To test a different podman, do:
@@ -60,6 +62,8 @@ REMOTE=
 ROOT_ONLY=
 ROOTLESS_ONLY=
 
+declare -a bats_opts=()
+
 declare -a bats_filter=()
 
 for i;do
@@ -69,6 +73,7 @@ for i;do
         --root)     ROOT_ONLY=1 ;;
         --rootless) ROOTLESS_ONLY=1 ;;
         --remote)   REMOTE=remote; echo "--remote is TBI"; exit 1;;
+        --ts|-T)    bats_opts+=("-T") ;;
         */*.bats)   TESTS=$i ;;
         *)
             if [[ $i =~ : ]]; then
@@ -94,7 +99,7 @@ if [ -z "$ROOTLESS_ONLY" ]; then
     sudo    --preserve-env=PODMAN \
             --preserve-env=PODMAN_TEST_DEBUG \
             --preserve-env=OCI_RUNTIME \
-            bats "${bats_filter[@]}" $TESTS
+            bats "${bats_opts[@]}" "${bats_filter[@]}" $TESTS
     rc=$?
 fi
 
@@ -102,7 +107,7 @@ fi
 echo "--------------------------------------------------"
 if [ -z "$ROOT_ONLY" ]; then
     echo "\$ bats ${bats_filter[@]} $TESTS"
-    bats "${bats_filter[@]}" $TESTS
+    bats "${bats_opts[@]}" "${bats_filter[@]}" $TESTS
     rc=$((rc | $?))
 fi