e2e tests: clean up antihelpful BeTrue()s

Many ginkgo tests have been written to use this evil form:

    GrepString("foo")
    Expect(that to BeTrue())

...which yields horrible useless messages on failure:

    false is not true

Identify those (automatically, via script) and convert to:

    Expect(output to ContainSubstring("foo"))

...which yields:

    "this output" does not contain substring "foo"

There are still many BeTrue()s left. This is just a start.

This is commit 1 of 2. It includes the script I used, and
all changes to *.go are those computed by the script.
Commit 2 will apply some manual fixes.

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

test/e2e/pod_infra_container_test.go

@@ -42,8 +42,7 @@ var _ = Describe("Podman pod create", func() {
 
 		check := podmanTest.Podman([]string{"pod", "ps", "-q", "--no-trunc"})
 		check.WaitWithDefaultTimeout()
-		match, _ := check.GrepString(podID)
-		Expect(match).To(BeTrue())
+		Expect(check.OutputToString()).To(ContainSubstring(podID))
 		Expect(len(check.OutputToStringArray())).To(Equal(1))
 
 		check = podmanTest.Podman([]string{"ps", "-qa", "--no-trunc"})