Pass through all_projects for get_server
Pass through all_projects for get_server

This function currently does not allow getting of a server
from all projects, and it can be quite useful to do so (for
various admin/operator activities) so allow get_server to
pass through 'all_projects' to the internally called
'search_servers' (and default it to false to retain the old
behavior).

Change-Id: I7b7534a044cfa0ccbaa11a635edcca388db27f0f

openstack/python-openstacksdk,dtroyer/python-openstacksdk,stackforge/python-openstacksdk,dtroyer/python-openstacksdk,openstack/python-openstacksdk,stackforge/python-openstacksdk