Matt Thompson caf196f798 Bump compute RAM to 8192MB
Currently, instances will not boot as nova.conf is configured with
`reserved_host_memory_mb: 2048` while the compute VMs themselves only
have 2048MB of RAM assigned.

This commit bumps the compute VMs to have 8192MB of RAM so that
instances can be successfully booted.

NOTE: Prior to all the recent refactors that have taken place, we were
      giving the compute VMs 9216MB of RAM.  I'm not entirely sure why
      this number was chosen but can happily change 8192MB to 9216MB to
      match what was being used before.

Change-Id: Ie36fcb4fb3f3b5bce27f2851fba0afc6e0d1966a
2017-08-29 15:05:51 -04:00
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