~andreserl/maas/packaging_fixes

[r=andreserl,newell-jensen][bug=1588116][author=mpontillo] Make messaging consistent for inputting the shared secret on the rack controller.

added added

removed removed

Template: maas-rack-udeb/shared-secret

Type: password

_Description: MAAS Rack Controller shared secret:

The MAAS Rack Controller needs to contact the MAAS server

with a share secret. This shared secret can be found on

the MAAS Region Controller server under /var/lib/maas/secret.

The MAAS rack controller needs to contact the MAAS region controller

with the shared secret found in /var/lib/maas/secret on the region controller.

Set the shared secret here.

~andreserl/maas/packaging_fixes_b8