Update sysutils/slurm-wlm to bug-fix-release 16.05.5

• Add readline to USES (bin/sacctmgr now links to libreadline and libhistory)
• Remove Cray node features patch now that it has been incorporated upstream
• Update pkg-plist

Reviewed by: swills (mentor)
Approved by: swills (mentor)
Differential Revision: https://reviews.freebsd.org/D8095