Fix the installation os setuptools so that it
does not conflict with mock.
Change-Id: I7c497d36c80a795fc99b329da2d171a265e4eacc
JIRA: STORPERF-35
Signed-off-by: Mark Beierl <mark.beierl@emc.com>
(cherry picked from commit 
fd4b99b086583bc8dc91950393ffed646f7eee59)
 
 virtualenv $WORKSPACE/storperf_venv
 source $WORKSPACE/storperf_venv/bin/activate
 
-easy_install -U setuptools
+pip install --upgrade setuptools
 pip install nose -I
 pip install coverage -I
 python ci/setup.py develop