Hpcidentybranch6

fixed build error

refactors. Rearrange slurm roles. Generate config files like /etc/hosts /etc/exports and slurm.conf statically before installing

(1) fixed ldapserver issues for centos 8; (2) add shib.conf to shibboleth; (3) removed certificate role

roles to calculate etcHosts etcExports and slurm.conf so we no longer do these when deploying each node, but in a preconfiguration stage