change assert_ to assertTrue

According to http://docs.python.org/2/library/unittest.html
assert_ is a deprecated alias of assertTrue.

Change-Id: I18db0af72934dde4498502fb29579941d020cf01
Mark swiftclient as being a universal wheel

Change-Id: I9580ab0f5bc53b472d0b633858090f9e0708ed90
Merge "change assert_ to assertTrue"
Merge "Mark swiftclient as being a universal wheel"