Remove unneeded constants

[Temikus]

It used to be relevant("RUNNING_STATE"), but no longer is.
See: fog/fog@7814ae5

Fixes #391

[codecov]

Codecov Report

Merging #500 into master will increase coverage by 1.79%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master     #500      +/-   ##
==========================================
+ Coverage   85.70%   87.50%   +1.79%     
==========================================
  Files         341      341              
  Lines        5737     5736       -1     
==========================================
+ Hits         4917     5019     +102     
+ Misses        820      717     -103     

Impacted Files	Coverage Δ
lib/fog/compute/google.rb	100.00% <ø> (ø)
...fog/compute/google/requests/set_server_metadata.rb	100.00% <ø> (ø)
lib/fog/compute/google/models/server.rb	79.52% <33.33%> (+1.42%)	⬆️
...ib/fog/google/requests/pubsub/pull_subscription.rb	91.66% <100.00%> (+1.66%)	⬆️
...g/compute/google/models/instance_group_managers.rb	30.43% <0.00%> (-69.57%)	⬇️
lib/fog/compute/google/models/instance_groups.rb	29.03% <0.00%> (-51.62%)	⬇️
lib/fog/compute/google/models/instance_template.rb	50.00% <0.00%> (-50.00%)	⬇️
...ib/fog/compute/google/models/instance_templates.rb	50.00% <0.00%> (-50.00%)	⬇️
...g/compute/google/requests/insert_instance_group.rb	57.14% <0.00%> (-35.72%)	⬇️
...og/compute/google/models/instance_group_manager.rb	64.70% <0.00%> (-26.48%)	⬇️
... and 48 more

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[Temikus]

Hm, something happened to our testing bucket gs://fog-test-bucket, investigating...