cleanup of iib-mqclient Dockerfile
cleanup of iib-mqclient Dockerfile

Signed-off-by: Mathias Merscher <51b7769398c961c3906a8358a3bad9abd27e7567@dg-i.net>

dennisseidel/iib-bestpractice-runtimes,madddi/iib-bestpractice-runtimes