Replace assertEqual(True, *) -> assertTrue(*)

Replace assertEqual(True, *) -> assertTrue(*)

Inspired by Dave Chen's change request on keystone about this, I
decided to check in cinder code to see if there were many cases.

Since unittest provides assertTrue and assertFalse, it is better
to use assertTrue(var) instead of assertEqual(True, var) and the same
thing applies to assertFalse.

I used these commands to search the occurrences:
* grep -PRIn "assertEqual\(True"
* grep -PRIn "assertEqual\(False"
* grep -PRIn "assertEqual\(\w+\s*,\s*True"
* grep -PRIn "assertEqual\(\w+\s*,\s*False"

Closes-Bug: #1430262

Change-Id: Ie92ce744d68a473b9ecc5214ed322bf2c5f5e000