Three tests were failing due to commit bbd85fd in the 2.2.0 release of
keystoneauth1, which changed the way that the user agent string is
generated. auth_token only needs to verify its part of the user agent
string rather than the entire string (the latter part of which is
controlled by keystoneauth).
Change-Id: I1e859440e8619857c92d3fbcbdd3b9fd2dc04e1e