feature #3331: Generate a master key file to encrypt data in the DB (.one/one_key). Encrypt VCENTER_PASSWORD in host template. VCenter driver derypts the password using the master key

(cherry picked from commit 8016908d3bc357bebf1af4a5f236af6952de6d34)

Conflicts:
	src/vmm_mad/remotes/vcenter/vcenter_driver.rb
Feature #3331: Fix for vCenter monitorization and in error break

(cherry picked from commit 7d94b9be2644d04aa17bca383d9d3e6df6145596)