Removes the dependence with aptitude

Removes the dependence with aptitude by replacing
the call of:
  aptitude purge -y ~npackage by apt_get purge -y package*

Change-Id: I08875ffad9dc6293047827666f02453a355b16ea
Closes-Bug: 1281410
Merge "Removes the dependence with aptitude"
Merge branch 'master' of github.com:openstack-dev/devstack