Tests: Use more setMwGlobals

Change some tests to use setMwGlobals to have restoring of globals after
the test.
This also removes some save/restore code, which is not needed, due to
the automatically restoring on tearDown with setMwGlobals.

Change-Id: I8d2ac9f6cc14f0bd4ee8eb851c09f2e71babc6e0
Merge "Tests: Use more setMwGlobals"