Added the capability to specify a DataCenter

[thebsdbox]

This adds the following capabilities:

• A -datacenter flag to specify a datacenter.
• The capability to define a "Datacenter" : "Production Web", in the json for committing to InfraKit.
• Environment VAR VCDATACENTER to specify the datacenter to use.
  A warning when left to default, as you'll still suffer problems with vCenter linked mode.

This addresses #620

Signed-off-by: Dan Finneran daniel.finneran@gmail.com

[codecov]

Codecov Report

Merging #624 into master will increase coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #624      +/-   ##
==========================================
+ Coverage   46.84%   46.89%   +0.05%     
==========================================
  Files          87       87              
  Lines        6197     7787    +1590     
==========================================
+ Hits         2903     3652     +749     
- Misses       3000     3841     +841     
  Partials      294      294

Impacted Files	Coverage Δ
pkg/template/defaults.go	62.5% <0%> (-8.93%)	⬇️
pkg/provider/google/plugin/instance/types/types.go	43.13% <0%> (-8.22%)	⬇️
pkg/types/spec.go	61.11% <0%> (-6.64%)	⬇️
pkg/types/hierarchy.go	73.91% <0%> (-6.09%)	⬇️
pkg/types/any.go	50% <0%> (-5.41%)	⬇️
pkg/store/swarm/swarm.go	62.68% <0%> (-4.59%)	⬇️
pkg/spi/event/types.go	59.52% <0%> (-4.58%)	⬇️
pkg/template/fetch.go	30.61% <0%> (-4.39%)	⬇️
pkg/provider/google/plugin/metadata/plugin.go	70.68% <0%> (-4.32%)	⬇️
pkg/template/util.go	60% <0%> (-3.64%)	⬇️
... and 72 more

---

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 224fd66...f4dce49. Read the comment docs.

[chungers]

LGTM