autoyast2: Several bugfixes

This update fixes the following issues for autoyast:
- bnc#811688: prevent execution of init-scripts before they are fetched
- bnc#565557: recognize mounted device also when by-id names are used in /proc/mounts
- bnc#803577: prevent kill of autoyast-initscripts.service by systemd

Fixed bugs
User initscripts are exiting arbitrarily and final reboot is canceled
autoyast=usb needs to check if device is already mounted
Initscripts executed before being fetched
Selected Binaries
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