Small fixes
  removed client certificate param from type definition
  fixed "Dir.exists?" condition

Change-Id: I8f85ddfd4d23ef313b27650988d70c0e9030270e
Added nicira plugin manifest

Change-Id: I458e07944b663498cf1b88371eeb7927faf09044
Nicira plugin basic integration
  added conditionals to compute.pp and neutron_router.pp
  added condition to disable dhcp colocation in neutron::agent::dhcp
  added condition to nicira plugin class to disable editing neutron config on compute

Change-Id: I5d9099920c4da510fe24987a4b8cbf5bea908943