always require explicit disconnect(), pin connection until disconnect()
test-kdbus: fixed unterminated string

Unterminated string array is used to populate random bus name
in check_prepare_env(). Added proper termination.

Signed-off-by: Jacek Janczyk <j.janczyk@samsung.com>
never schedule work for a dead connection
Merge remote-tracking branch 'kdbus/master' into 3.14/kdbus