XenServer: Fix initramfs scripts

During bashate -ing some files with .sh extension has been modified,
which are interpreted with /bin/sh, which takes a different syntax.
Fixing the issue:
    - rename the files, so they are not picked up
    - use syntax that's understood by sh

Change-Id: I617b24813df86687ca33745d0c940b0c659f2e14
Merge "XenServer: Fix initramfs scripts"