Add configuration to disable synchronization

Cache, event, index and websession synchronization can be disabled by
setting synchronize parameter to false, example:

[index]
  synchronize = false

Change-Id: I390ce723b665068b018953358d33a8798e74fb2a
6 files changed
tree: 7bc01991807d746409cdf732a041fb1980c4362a
  1. lib/
  2. src/
  3. .buckconfig
  4. .gitignore
  5. .mailmap
  6. BUCK