Update version to 4.2.1-SNAPSHOT

Change-Id: Id38a6bd0e5e02ad96ff1e8d36b8ab75c89b55085
Get tests properties from system properties

Change-Id: Ia68553a5de675635ecc02a09af876d795641bcd7
Refactoring to use the new ConnectorApp in kmf-media-connector

Change-Id: I3b0f1ae6f0ed0b1089c6f7712842aa73a801f4f3
Improve testing

Change-Id: I2e82c1b96837fc29391a2cdea1ea6124f7dd47e2