Deprecate smartos mdata grains

[Ch3LL]

What does this PR do?

deprecate some smartos grains

What issues does this PR fix or reference?

#49420

Previous Behavior

the smartos grains hypervisor_uuid and datacenter were still apart of the grains.

New Behavior

Remove some smartos grains:

• The hypervisor_uuid has been replaced with mdata:sdc:server_uuid grain.
• The datacenter has been replaced with mdata:sdc:datacenter_name grain.

Tests written?

No - removing legacy code

Commits signed with GPG?

Yes

[dwoz]

The last change was just a merge conflict in docs. Tests passed otherwise.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@882a832). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master   #55609   +/-   ##
=========================================
  Coverage          ?   39.06%           
=========================================
  Files             ?     1467           
  Lines             ?   260302           
  Branches          ?    56406           
=========================================
  Hits              ?   101659           
  Misses            ?   147293           
  Partials          ?    11350

Flag	Coverage Δ
#m2crypto	38.5% <ø> (?)
#py2	38.67% <ø> (?)
#py3	38.5% <ø> (?)
#runtests	39.06% <ø> (?)
#ubuntu1604	39.06% <ø> (?)
#zeromq	39.06% <ø> (?)

Impacted Files	Coverage Δ
salt/grains/mdata.py	25.38% <ø> (ø)