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

change account org name and secrent key to variables

rearrange/rename slurm roles

(1) ssl.conf boken debian 8, removed; (2) fixed ldapserver https for …

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