Add python-psutil version dependency

Due to related bug
https://bugs.launchpad.net/juniperopenstack/+bug/1540973 , python-psutil
dependency is updated to 0.6.0.

This change reflects this in the RPM spec file.

debian/control does not specify a python-psutil dependency, and this
change does not change that.

Change-Id: I1284c92873b82f0d1cfd1dbcdd1379df3be03130
Closes-Bug: #1541448
Signed-off-by: Martin Millnert <martin@millnert.se>

rpm/contrail/contrail.spec

@@ -404,7 +404,7 @@ Requires: python-lxml >= 2.3.2
 Requires: python-pycassa
 Requires: python-thrift >= 0.9.1
 Requires: python-keystone
-Requires: python-psutil
+Requires: python-psutil >= 0.6.0
 Requires: python-requests
 Requires: python-zope-interface
 Requires: xmltodict >= 0.7.0
@@ -484,7 +484,7 @@ Requires:           python-pycassa
 Requires:           redis-py > 0.1-2contrail
 Requires:           redis >= 2.6.13-1
 Requires:           python-contrail >= %{_verstr}-%{_relstr}
-Requires:           python-psutil
+Requires:           python-psutil >= 0.6.0
 Requires:           python-prettytable
 Requires:           python-geventhttpclient
 Requires:           protobuf