Making the process of defining host backups easier

Removed all the info about schedules, days, jobdefaults from
backup::host to make it easier to work with. Also created a (hopefully
even) distribution for machines on days of the week by using uniqueid
fact. Gone is the ugly sets hash and replaced with an array and an
optional pool argument which defaults to 'production'

Change-Id: Iacb3932a8727661d79d4987c825a6066b2c1c0d2
Merge "Making the process of defining host backups easier" into production