Remove plugin installation scripts from plugin

Plugins installation process is added to fule client
which is installed on master node
https://review.openstack.org/#/c/129215/

Change-Id: If0bf82a83c8f8c5be4705a3ffa2c4c72b04bd77c
Implements: blueprint cinder-neutron-plugins-in-fuel
Merge "Remove plugin installation scripts from plugin"