Appscale-tools

Highlights of features/bugfixes in this release:
- Dispatch routing from yaml
- Remove azure / keyring dependencies
- Remove outdated upgrade code
- Fix unit tests for FDB changes
- Add fdb_clusterfile_content property to AppScalefile
- set version to 3.8.0
- Remove iaas system manager
- AppController client handle not ready error
- Add search2 role
- appscale.tools.agents replacement with appscale.agents
- merge release-3.7 branch back into master
- Log warning on deploy for unsupported queue rate options
- Include subnet and vpc IDs when setting parameters
- Remove login role

Highlights of features/bugfixes in this release:
- pin keyring to < 19.0.0 for py2 compatibility

Highlights of features/bugfixes in this release:
- Include subnet and vpc IDs when setting parameters
- Remove login role

Highlights of features/bugfixes in this release:
- Issue-715 - SSH login problems when starting cloud-mode on GCE (tools)

Highlights of features/bugfixes in this release:
- Update error messages for min/max_machines
- Warn about non appscale images for Azure
- Azure error handling
- 3.6.0 version bump
- Limit Pip version
- Azure managed disks
- Allow the user to deploy a service yaml file
- Fix matching nodes
- Limit the number of retries for user operations
- Azure package upgrades
- Don't suppress timeouts when making AC calls
- Limit msrest version
- Stats command
- One appserver running for Dashboard is enough to say "Ok"
- Consolidate configuration parsing functionality