Update the new US based locations.

[mohsen-hassani-cs]

New US location URLs related to CloudSigma are updated.

Description

The new locations are wdc.alpha3cloud.com and sjc.alpha3cloud.com

[Kami]

Thanks for the contribution. The change looks good to me, but it would be good to also add / update test cases.

Having said that - should this driver also be renamed from CloudSigma to Alpha2Cloud? Or should the driver name be left as is and we perhaps add an alias for Alpha2Cloud -> Cloud Sigma (or vice versa).

[codecov-commenter]

Codecov Report

Merging #1781 (3ccff87) into trunk (a4f4f90) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##            trunk    #1781   +/-   ##
=======================================
  Coverage   83.41%   83.41%           
=======================================
  Files         394      394           
  Lines       87680    87680           
  Branches     9261     9261           
=======================================
  Hits        73135    73135           
  Misses      11386    11386           
  Partials     3159     3159           

Impacted Files	Coverage Δ
libcloud/common/cloudsigma.py	100.00% <ø> (ø)

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[mohsen-hassani-cs]

Thanks @Kami

The driver should not be renamed. It should be left as CloudSigma.
We have just changed the URLs for two locations but the driver and the functionality should be the same.

[Kami]

@mohsen-hassani-cs Thanks for confirming and sorry for the delay (I've missed your comment). I will go ahead and merge you PR.

Thanks again for your contribution.