Don’t count non-implemented mocks in code coverage

[Temikus]

Looking at our coverage graphs we're counting in non-implemented mocks in code coverage which doesn't make much sense.

This PR is an attempt to fix that so finding models that need better coverage is easier.

[houndci-bot]

Style/StringLiterals: Prefer double-quoted strings unless you need single quotes to avoid extra backslashes for escaping.

[codecov]

Codecov Report

Merging #465 into master will increase coverage by 3.21%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #465      +/-   ##
==========================================
+ Coverage   85.65%   88.86%   +3.21%     
==========================================
  Files         339      339              
  Lines        5840     5629     -211     
==========================================
  Hits         5002     5002              
+ Misses        838      627     -211

Impacted Files	Coverage Δ
lib/fog/compute/google/requests/insert_server.rb	82.22% <ø> (+1.78%)	⬆️
lib/fog/compute/google/requests/get_target_pool.rb	100% <ø> (+10%)	⬆️
lib/fog/storage/google_json/requests/put_object.rb	100% <ø> (+4.54%)	⬆️
...oogle/requests/list_aggregated_forwarding_rules.rb	100% <ø> (+11.11%)	⬆️
...mpute/google/requests/insert_target_https_proxy.rb	100% <ø> (+11.11%)	⬆️
...ib/fog/compute/google/requests/get_machine_type.rb	100% <ø> (+10%)	⬆️
lib/fog/google/requests/sql/import_instance.rb	50% <ø> (+3.33%)	⬆️
...pute/google/requests/get_instance_group_manager.rb	100% <ø> (+11.11%)	⬆️
...oogle/requests/remove_target_pool_health_checks.rb	70% <ø> (+6.36%)	⬆️
...ute/google/requests/list_aggregated_subnetworks.rb	100% <ø> (+11.11%)	⬆️
... and 201 more

---

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[codecov]

Codecov Report

Merging #465 into master will increase coverage by 5.46%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #465      +/-   ##
==========================================
+ Coverage   85.65%   91.11%   +5.46%     
==========================================
  Files         339       24     -315     
  Lines        5840      720    -5120     
==========================================
- Hits         5002      656    -4346     
+ Misses        838       64     -774

Impacted Files	Coverage Δ
...og/google/requests/monitoring/create_timeseries.rb	100% <ø> (+10%)	⬆️
...oogle/requests/monitoring/get_metric_descriptor.rb	100% <ø> (+11.11%)	⬆️
...le/requests/monitoring/create_metric_descriptor.rb	100% <ø> (+9.09%)	⬆️
...le/requests/monitoring/delete_metric_descriptor.rb	87.5% <ø> (+9.72%)	⬆️
.../monitoring/list_monitored_resource_descriptors.rb	100% <ø> (+11.11%)	⬆️
.../fog/google/requests/monitoring/list_timeseries.rb	61.9% <ø> (+2.81%)	⬆️
lib/fog/google/shared.rb	55.05% <0%> (-2.25%)	⬇️
lib/fog/compute/google/models/zones.rb
lib/fog/compute/google/models/projects.rb
lib/fog/google/models/sql/operations.rb
... and 107 more

---

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Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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