adds exclude_projects option to exclude any global project

[kgaikwad]

No description provided.

[Temikus]

@kgaikwad Thanks again! ^___^

[codecov]

Codecov Report

Merging #491 into master will decrease coverage by 1.49%.
The diff coverage is 75%.

@@            Coverage Diff            @@
##           master     #491     +/-   ##
=========================================
- Coverage      89%   87.51%   -1.5%     
=========================================
  Files         340      311     -29     
  Lines        5659     5167    -492     
=========================================
- Hits         5037     4522    -515     
- Misses        622      645     +23

Impacted Files	Coverage Δ
lib/fog/compute/google.rb	100% <ø> (ø)	⬆️
lib/fog/compute/google/real.rb	100% <100%> (ø)	⬆️
lib/fog/compute/google/mock.rb	48% <50%> (-2%)	⬇️
lib/fog/compute/google/models/images.rb	88.67% <75%> (-1.33%)	⬇️
lib/fog/google/models/sql/user.rb	46.42% <0%> (-50%)	⬇️
lib/fog/google/requests/sql/update_instance.rb	63.63% <0%> (-36.37%)	⬇️
lib/fog/google/models/sql/ssl_certs.rb	45% <0%> (-35%)	⬇️
lib/fog/google/models/sql/ssl_cert.rb	54.28% <0%> (-34.29%)	⬇️
lib/fog/google/models/sql/users.rb	80% <0%> (-20%)	⬇️
lib/fog/google/requests/sql/list_users.rb	87.5% <0%> (-12.5%)	⬇️
... and 37 more

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