Controller to listen to expired flow removal message

Controller to listen to expired flow removal message
- Added plugin-to-FM async notification path for Flow Programmer so that functional modules can receive notification of flow removal sent by switch
- On flow programming phase, instruct switch to notify controller about flow removal only if hard or idle timeout is set
- Have FRM listen to flow removal message so that it updates the sw view of installed flows and the static flow config installation status accordingly
- Changed equals logic in MatchField as a null mask object for net address is equivalent to a /32 (or /128) bitmask
- Removed strict dependencies in SAL Activator. SAL services startup should not depend on external services
- Enforced the sun_doding_style.xml in newly added or modified files
Change-Id: Ifc913ceef87aac0b4694bcd7c47f29d5cb10c6ed
Signed-off-by: Alessandro Boch <aboch@cisco.com>