Sync submodules in update
Make symmetric_secret optional in ccng template

This is no longer a required property in ccng.
Moreover, its absence is used to indicate that the
UAA is using an asymmetric signature for tokens so
it has to be optional in the yaml template.
[services-ng] postgresql xlog enforcer

Change-Id: Iea3a8fe55714568c040cee18ab64642214a6053b
bump ccng and health manager
Update warden

$ git shortlog fb9aea0..2ab01c5
Matthew Boedicker and Pieter Noordhuis (2):
      Stop streaming after client disconnects
      Don't crash on unmatched quote in repl
moved vmc checks into vmc repo
added checkfile for tracking github issues
bump yeti
Bump CCNG for service snapshots
Bump src/cloud_controller_ng:

Alex Suraci & Bleicke (1):
  Don't let app start if uploaded bits are missing or invalid
  [#41992297]
Merge pull request #60 from mflu/xlog_enforcer

[services-ng] add plan configurations for xlog_enforcer
Bump p02
Merge branch 'master' into release-candidate
bump to master levels
Merge pull request #59 from tekul/feature/ccngsecret

Make symmetric_secret optional in ccng template
Bump dea

dea shortlog 2ca4fcd..e7db702
Jesse Zhang (1):
      Remove broad rescue [#46751287]

Maria Shaldibina and Max Brunsfeld (3):
      Reorganize buildpack fixtures
      Compute reserved memory and disk correctly in ResourceManager
      Support memory and disk overcommit factors [#46311945]
Postgres startup timeout typo fixed
Bump CCNG

git shortlog 1e37c0..a6dff3
Alex Suraci & Bleicke (1):
      Remove a broad rescue [#46751287]

David Sabeti and Tony Hansmann (1):
      Make sqlite3 production dependency in Gemfile

Dmitriy Kalinin and Mark Rushakoff (10):
      upgrade sequel
      monkey patch sequel with class_evals instead of reopening classes
      remove fk constraints before dropping columns for mysql
      make sequel happier
      fix querying by boolean api when using mysql db
      make sure that apps cannot have same name in different case
      fix tests when running with postgres
      add postgres and mysql travis build jobs
      mention DB_CONNECTION env variable for testing
      wrap README to 80 chars
Merge remote-tracking branch 'origin/master' into release-candidate
Bump src/tools:

Bleicke & Bob Nugmanov (1):
  collector: remove framework, runtime references