Add test for multi DNS, bnc#901497
mkcloud: update cloudsource information
qa_crowbarsetup: only enable multidns test for new Cloud
IPMI range is taken from network proposal.
Changed the ipmitool command.
qa_crowbarsetup: use math for BMC IP calc
qa_crowbarsetup: drop old IPMI passwords

add option to give other PWs with extraipmipw env variable
trackupstream: build Master for SLE12
qa_crowbarsetup.sh: Improve multi-dns test