Add requirements check to ldappool
Add requirements check to ldappool

Add the requirements check to ldappool. This is to ensure ldappool
follows the g-r of openstack and is co-installable with keystone
etc.

Change-Id: I2539685cc115a5173cdcdeea07ffb0f08036beed

dongwenjuan/project-config,openstack-infra/project-config,Tesora/tesora-project-config,Tesora/tesora-project-config,openstack-infra/project-config,dongwenjuan/project-config