Branch HEAD

b=14095
i=nathan.rutman
i=brian

1) add lustre_start utility to start or stop multiple Lustre servers
   from a CSV file
2) fix the utility path issue in bug 14094
3) use 'error_output()' to format error messages
4) move common variables and functions to lc_common
5) fix the "lustre_config -h" issue in bug 14133
6) fix the module_opts issue in bug 14092
7) remove the duplicates from checking lnet connectivity to MGS node