Override session cookies with username flag

Review Request #7289 — Created May 6, 2015 and submitted — Latest diff uploaded

Information

RBTools
release-0.7.x
84a8ec3...

Reviewers

Previously, when the --username flag was provided to RBTools and a
session cookie already existed, RBTools would prompt for the password
but never use it (because of the session cookie). We now clear the
session cookie when the --username flag is given.

Ran unit tests.

Attempted to post a review request with the --username parameter and
a bogus password; the review request was not created. It was created
when the correct password was used.