fix parsing of pbsnodes output

[amerzky@trestles-login2 pilot-53b6efff74df924ca6303d02]$ pbsnodes -a | egrep "(np|pcpu)" | sort -u
     note = data unpack had inadequate space
     np = 16
     np = 32
[amerzky@trestles-login2 pilot-53b6efff74df924ca6303d02]$ pbsnodes -a | egrep "(np|pcpu)\s*=" | sort -u
     np = 16
     np = 32

This patch was only applied to the code branch which is not specific to "PBSPro_12" -- I have no idea if the patch is suitable for all versions in that code path, nor do I know if it would make sense to apply it to the PBSPro_12 regex..