Enhancement in switch configuration

Enhancement in switch configuration

CHANGE:
- Enhance SwitchConfig object to carry any property and not only the three hardcoded fields it has now
- Added removeNodeConfig() and updateNodeConfig() (for adding and modifying) methods to ISwitchConfig
- Deprecated updateSwitchConfig() in favor of updateNodeConfig()
- Deprecated the ISwitchManager.getNodeDescription() in favor of the more extensible existing approach
   of directly requesting the description property
- Bumped switchmanager version number

Change-Id: I000f4b22ec37f9c61fdb5c1ea4e6fdac93811f02
Signed-off-by: Pramila Singh <pramisin@cisco.com>