Add read-only 'pod' property to Machine objects

[ittner]

This new property allows the client to know in which pod a virtual machine was commissioned (if any). Very useful for building dependency trees between machines.

[codecov-commenter]

Codecov Report

Merging #245 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #245   +/-   ##
=======================================
  Coverage   67.98%   67.99%           
=======================================
  Files          70       70           
  Lines        5726     5727    +1     
  Branches      988      988           
=======================================
+ Hits         3893     3894    +1     
  Misses       1610     1610           
  Partials      223      223           

Impacted Files	Coverage Δ
maas/client/viscera/machines.py	72.47% <100.00%> (+0.08%)	⬆️

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[codecov-io]

Codecov Report

Merging #245 (f3fb3ec) into master (575d3f7) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #245   +/-   ##
=======================================
  Coverage   67.98%   67.99%           
=======================================
  Files          70       70           
  Lines        5726     5727    +1     
  Branches      988      988           
=======================================
+ Hits         3893     3894    +1     
  Misses       1610     1610           
  Partials      223      223           

Impacted Files	Coverage Δ
maas/client/viscera/machines.py	72.47% <100.00%> (+0.08%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 94fe03e...c964794. Read the comment docs.

[cpg1111]

LGTM

[codecov-commenter]

Codecov Report

Merging #245 (fea8c2c) into master (1ff28d5) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head fea8c2c differs from pull request most recent head 8fd5ccc. Consider uploading reports for the commit 8fd5ccc to get more accurate results

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@@           Coverage Diff           @@
##           master     #245   +/-   ##
=======================================
  Coverage   69.16%   69.17%           
=======================================
  Files          73       73           
  Lines        5958     5959    +1     
  Branches     1336     1336           
=======================================
+ Hits         4121     4122    +1     
  Misses       1607     1607           
  Partials      230      230           

Files Changed	Coverage Δ
maas/client/viscera/machines.py	73.08% <100.00%> (+0.08%)	⬆️

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[SK1Y101]

LGTM also, merging as tests have passed