Modifying DevStack to support FlowVisor 1.0
Added Janus host and port info in controller and agent node localrc's
gen-local should ask user if Janus is enabled when generating agent nodes
Added further support for Janus in stack.sh script
  - Use Ryu 'ryu2janus' branch if Janus is enabled
    - Until Quantum has its own drivers for Janus, need to maintain 2 branches for Ryu
  - Pass Janus host and port info to Ryu OF event forwarding app
Migrate Janus DB from 'ryu' to 'janus'
Set default ports for Janus: 8095 for admin APIs and 8100 for public APIs
  - Avoids confusion (Ryu uses 8090 when Janus is not enabled)
Changing Janus default ports back to 8081 for public, 8091 for admin
    - Use public port for OS_JANUS_URL
Merge remote-tracking branch 'origin/silver' into silver

Conflicts:
	stack.sh
Fixed permission issues in FV-related area in stack.sh script
Fixed minor typo error in whale lib script
Merge pull request #11 from t-lin/silver

Silver