Bump src/cloud_controller_ng

Bump cloudfoundry/cloud_controller_ng:
  Chris Adams:
     Merge pull request #233 from sykesm/diego-staged-event ( Travis started: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/25019334 )
  Derek Richard:
     Add /v2/apps/:guid/env and bump CC version ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/24997737 )
  Matthew Sykes:
     Update detected buildpack on diego staging path ( Travis Unknown )

Signed-off-by: Sabha Parameswaran <sparameswaran@gopivotal.com>
Change default bosh-lite stemcell to go-agent
Unset the GEM_PATH due to a bug in the maven sass plugin
Fix login server war file path

https://www.pivotaltracker.com/story/show/70614624
Add login server smtp options to cf-properties.yml

So that values provided in a manifest will be applied

https://www.pivotaltracker.com/story/show/69940642
Bump UAA to version 1.6.4
Bump Login Server to version 1.6.2
Add PWS Login Server link placeholders.
- To facilitate overriding them in cf-aws-stub for testing on A1.

@see https://github.com/cloudfoundry/deployments-aws/pull/7

https://www.pivotaltracker.com/story/show/70697714
Fixed swapped template values

passwordAttributeName and passwordEncoder default values were swapped.
Now fixed.

https://www.pivotaltracker.com/story/show/71180430