Added: the ssh plug-in has been extended to support multiple agents per host. (GH-25)
Removed unused variable.
cosmetic changes
key-value: fixed: clear input values map before inserting new values
New key-value test app. The test workflow:
	#1. Update the given key with value X (starting from X=1)
	#2. Wait until all other instances of the key also get value X
	#3. Repeat the procedure with X = X + 1
	-->> return success (0) when keys of all instances gets max value
	-->> return failed (1) when one or more instances failed to updated in a given amount of time
key-value:
	- removed some unused called
	- added log messages
	- changed time-out for putValue to 2000 milliseconds
	- minor optimization
key-value user API: implemented a user function callback on properties update (GH-29)
added missing include
Break the loop if we are good to go.
dds-key-value: make file_lock a global variable and property_tree local this resolves some of the issues in high load environment.