software/slapos-testing: remove some duplicate version pins

these were already defined in stacks and were different here for no
apparent reason.

software/slapos-testing/software.cfg

@@ -245,12 +245,10 @@ slapos.core =
 slapos.toolbox =
 rubygemsrecipe =
 
-# All other depencies should be pinned.
 Pygments = 2.1.3
 zc.lockfile = 1.4
 bcrypt = 3.1.4
 dnspython = 1.15.0
-funcsigs = 1.0.2
 httmock = 1.2.6
 manuel = 1.9.0
 mock = 2.0.0:whl
@@ -258,7 +256,6 @@ testfixtures = 6.11.0
 pycurl = 7.43.0.2
 pyflakes = 2.0.0
 zope.testing = 4.6.2
-urllib3 = 1.24.1
 psycopg2 = 2.8.6
 
 [versions:python2]