[build.webkit.org] Add copyright message to steps_unittest.py. This file is missing copyright message. Note that it was renamed from mastercfg_unittest.py to steps_unittest.py in https://trac.webkit.org/changeset/225548/webkit
Created attachment 411582 [details] Patch
Committed r268595: <https://trac.webkit.org/changeset/268595> All reviewed patches have been landed. Closing bug and clearing flags on attachment 411582 [details].
<rdar://problem/70380760>