Remove old excludes

These are detected as errors since the clean up was done[1] in
the requirements repository.

[1] 314734e938f107cbd5ebcc7af4d9167c11347406

Bump the minimum versions to avoid installing these known bad versions.

Change-Id: I5ab0c3a1ac208e3967e65c298573079283a7b6cd

test-requirements.txt

@@ -1,5 +1,5 @@
 hacking==6.1.0 # Apache-2.0
-coverage!=4.4,>=4.0 # Apache-2.0
+coverage>=4.4.1 # Apache-2.0
 ddt>=1.2.1 # MIT
 fixtures>=3.0.0 # Apache-2.0/BSD
 psycopg2-binary>=2.8 # LGPL/ZPL