Cleanup Perforce test case, and thereby its output a little.
Summary: Making the test code a little cleaner by using TestCore::self()
Test Plan: Tests execute as before, output is now not cluttered with init related stuff
Reviewers: KDevelop, kfunk
Reviewed By: KDevelop, kfunk
Differential Revision: https://phabricator.kde.org/D14959
(cherry picked from commit 2e98de947febd5297475c22b35ac390ed693de5b)