DRLM v2.4.7

[proura]

• PR type: Bug Fixing & Enhancement
• Impact: Low
• Did you test this PR? No! Tested function by function but not from new package and installation.
• Brief description of the changes in this PR:

Bugfix removing authorized keys
Bugfix in installclient DRLM Proxy (hostname unreachable)
Improved unsched client sql select 
Changed default QEMU_NBD_OPTIONS
Mutex race solved in nbd assignment
Improved network, client, backup and job lists
Bugfix in DRLM PROXY ReaR URL generation