[#48749497] Set CANDIDATE_BUILD_NUMBER for later builds in the chain and update the BOSH version number before building stemcells
[finishes #48749497] - ci stemcell tasks to support build pipeline
Upgrade fog gem to v1.11.1
use new pipeline stemcell builds for jenkins
switch ci publish gems to use the gem from the pipeline build bucket
add parallel_tests gem to ci_build_with_candidate_gems
Clean director snapshoting and added snapshot deployment

[#46837175]
Added Director schedule with snapshot deployments task

- Uses rufus scheduler for defining scheduled tasks
- Can be set in the director.yml as scheduled_jobs array

[#46837175]
Fix user logging for create stemcell and delete deployment tasks
Ensure scheduler properly handles no scheduled jobs

[#46837175]
Added integration test for director scheduler

[#46837175]
use bundler for pipeline gems
Turn on scheduled snapshots for bootstrapped microbosh and bosh

[Finishes #46837175]