Instead of relying on hard coded offsets, query each slot's status with ```ipmitool channel getaccess``` and use the first slot that is unlocked.
This fixes an issue on certain Cray x86 nodes that have arbitrary locked IPMI user slots.
RH7/Centos7 and recent versions of fedora relocate `/*bin/*` into `/usr/*bin/`. This causes
conflicts for upgrades against xCAT-genesis-scripts-* packages which expect the `/bin` a to be
a directory while `xCAT-genesis-base-*` packages provide a link. Relocating all files into `/usr`
fixes that conflict and allows a clean upgrade from all old versions.
