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/run_working_dir_test.go

@@ -60,7 +60,7 @@ WORKDIR  /etc/foobar`, ALPINE)
 
 		session = podmanTest.Podman([]string{"run", "test", "ls", "-ld", "."})
 		session.WaitWithDefaultTimeout()
-		Expect(session.LineInOutputContains("bin")).To(BeTrue())
+		Expect(session.OutputToString()).To(ContainSubstring("bin"))
 
 		session = podmanTest.Podman([]string{"run", "--workdir", "/home/foobar", "test", "pwd"})
 		session.WaitWithDefaultTimeout()