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