VOL-2452: MIB Templating

- Release 2.3.0

- working with 2 onu types plus a patched bbsim

- templates must be loaded in etcd at system start
  time or just before the onus are plugged in/discovered.

- templates can be added or updated later

- these will likely be managed similarly to TechProfile templates
  and loaded at the same time and not checked in here.

- currently creating a new template requires running in DEBUG
  mode and gathering the mib that printed to the log for a
  new upload.  Then swapping out serial numbers and mac addresses
  with the replacement tokens, removing the timestamps and adding
  template_name and template_created headers

Change-Id: I2227e5e4dd85bd6ad562c9f241acf641d393588b
8 files changed