Cleaning testrepository occurrences.

Since we have migrate test to stestr we can remove testrepository
from imports and stop to ignore him.

Change-Id: I74a24f19268d39dbce42963c95a9f06ca9b3f014

.gitignore

@@ -22,7 +22,6 @@ build/
 doc/build/
 doc/source/api/
 dist/
-.testrepository/
 /doc/source/sample.config
 .stestr/
 

lower-constraints.txt

@@ -48,7 +48,6 @@ Sphinx==1.6.2
 sphinxcontrib-websupport==1.0.1
 stestr==2.0.0
 stevedore==1.20.0
-testrepository==0.0.18
 testscenarios==0.4
 testtools==2.2.0
 traceback2==1.4.0

test-requirements.txt

@@ -4,7 +4,6 @@
 hacking!=0.13.0,<0.14,>=0.12.0 # Apache-2.0
 
 fixtures>=3.0.0 # Apache-2.0/BSD
-testrepository>=0.0.18 # Apache-2.0/BSD
 testscenarios>=0.4 # Apache-2.0/BSD
 stestr>=2.0.0 # Apache-2.0
 testtools>=2.2.0 # MIT