WIP: Migrate Baobab to CentOS7

Hi there,

the first nodes in CentOS7 are now available (with specific partitions, when applicable):

4 more:

  • node[226-229] in partition mono-shared-EL7 and shared-EL7
    Many thanks to the Golling group to have accepted to install their new nodes directly in CentOS7!

Thx, bye,
Luca