Add “host” parameter to SQL user factory

[Temikus]

Semi-temporary fix for #462

Tests are still very much valid but depending on the outcome of the internal issue we may need to make some adjustments.

[codecov]

Codecov Report

Merging #463 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #463   +/-   ##
=======================================
  Coverage   85.65%   85.65%           
=======================================
  Files         339      339           
  Lines        5840     5840           
=======================================
  Hits         5002     5002           
  Misses        838      838

Impacted Files	Coverage Δ
lib/fog/google/models/sql/user.rb	96.42% <ø> (ø)	⬆️

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[codecov]

Codecov Report

Merging #463 into master will increase coverage by 4.7%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master     #463     +/-   ##
=========================================
+ Coverage   85.65%   90.35%   +4.7%     
=========================================
  Files         339       24    -315     
  Lines        5840      726   -5114     
=========================================
- Hits         5002      656   -4346     
+ Misses        838       70    -768

Impacted Files	Coverage Δ
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/compute/google/requests/list_images.rb
lib/fog/storage/google_json/requests/put_object.rb
...oogle/requests/list_aggregated_forwarding_rules.rb
...mpute/google/requests/insert_target_https_proxy.rb
...ib/fog/compute/google/requests/get_machine_type.rb
.../fog/compute/google/requests/get_zone_operation.rb
lib/fog/google/models/sql/operations.rb
... and 305 more

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