Remove python clients from test-requirements.txt

These should not be necessary.

Change-Id: Ide02b7da2a2a2d528c171772f5552f4529ffe880

lower-constraints.txt

@@ -68,14 +68,8 @@ pyinotify==0.9.6
 pyOpenSSL==17.5.0
 pyparsing==2.2.0
 pyperclip==1.6.0
-python-ceilometerclient==2.5.0
 python-dateutil==2.7.0
-python-glanceclient==2.9.1
-python-keystoneclient==3.15.0
 python-mimeparse==1.6.0
-python-neutronclient==6.7.0
-python-novaclient==10.1.0
-python-openstackclient==3.12.0
 python-subunit==1.2.0
 pytz==2013.6
 PyYAML==3.12

test-requirements.txt

@@ -12,9 +12,6 @@ oslo.log>=3.36.0 # Apache-2.0
 oslotest>=3.2.0 # Apache-2.0
 PrettyTable<0.8,>=0.7.1 # BSD
 PyYAML>=3.12 # MIT
-python-ceilometerclient>=2.5.0 # Apache-2.0
-python-neutronclient>=6.7.0 # Apache-2.0
-python-openstackclient>=3.12.0 # Apache-2.0
 pytz>=2013.6 # MIT
 stestr>=2.0.0 # Apache-2.0
 testscenarios>=0.4 # Apache-2.0/BSD