Make Elasticsearch more reliable in beta

In beta multicast isn't reliable so we have to rely on Elasticsearch's
unicast discovery to seed the cluster.  This sets that up.

Bug: 63571
Change-Id: I2fc590b7382728e9f2baca62a35601b9f0b1ad51
autoinstall: add partman for ms-fe/ms-be esams

ms-fe esams have HW RAID1 with 2x250G hard disks. Use the simplest
config of ours (no SW RAID, no LVM, ext3), which happens to be lvs.cfg.

ms-be esams have 12x2T hard disks, but unlike eqiad, no SSDs. Create a
new profile that is a mixture between ms-be-eqiad & raid1-varnish: it
creates a 60G RAID1 / on the two first disks, swap, and formats the rest
as XFS, to be used by Swift.

Change-Id: Id435306490ce50d719785ac87d26e4c570fa0174
Merge "Make Elasticsearch more reliable in beta" into production