Added python-pip installation to dev environment instruction
Added python-pip installation to dev environment instruction

Now python-pip is not installed with python. Probably something changed,
because exactly same actions worked half of year ago. python-pip is already
in requirements for fedora.

Change-Id: I49c98775d1ae8a177b6b738d183152ccce86d7c8

zhangjunli177/sahara,redhat-openstack/sahara,zhangjunli177/sahara,esikachev/scenario,bigfootproject/sahara,zhujzhuo/Sahara,keedio/sahara,mapr/sahara,xme1226/sahara,esikachev/scenario,xme1226/sahara,ekasitk/sahara,zhujzhuo/Sahara,esikachev/sahara-backup,keedio/sahara,bigfootproject/sahara,crobby/sahara,ekasitk/sahara,redhat-openstack/sahara,mapr/sahara,esikachev/sahara-backup,tellesnobrega/storm_plugin,bigfootproject/sahara,crobby/sahara,zhujzhuo/Sahara,esikachev/scenario,henaras/sahara,xme1226/sahara,matips/iosr-2015,egafford/sahara,matips/iosr-2015,henaras/sahara,egafford/sahara,zhangjunli177/sahara,citrix-openstack-build/sahara,mapr/sahara,henaras/sahara,tellesnobrega/sahara,redhat-openstack/sahara,esikachev/sahara-backup,tellesnobrega/storm_plugin,citrix-openstack-build/sahara,keedio/sahara,citrix-openstack-build/sahara,crobby/sahara,openstack/sahara,tellesnobrega/sahara,matips/iosr-2015,tellesnobrega/storm_plugin,ekasitk/sahara,openstack/sahara