ASM-2133 use racadm racreset soft instead of hard

The hard option reboots the server in addition to the iDrac which will
interrupt any operations in progress on the server. The soft option
only restarts the iDrac.
Merge pull request #57 from gavin-scott/asm-2133-7.6.0

ASM-2133 use racadm racreset soft instead of hard