Added project ID to volume query when checking root disk size.

[kovukono]

At the moment, if specifying a size for a root drive of an instance, any attempt to rerun the playbook will fail on currently-deployed instances if the VM is deployed outside of the root project. This PR makes sure the volumes query is within the same project as the VM it's trying to determine the root volume size of.

[codecov[bot]]

Codecov Report

Merging #90 (4430658) into master (f3e6e85) will decrease coverage by 0.01%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master      #90      +/-   ##
==========================================
- Coverage   84.15%   84.13%   -0.02%     
==========================================
  Files          56       56              
  Lines        5611     5611              
  Branches     1260     1260              
==========================================
- Hits         4722     4721       -1     
- Misses        446      448       +2     
+ Partials      443      442       -1     

Impacted Files	Coverage Δ
plugins/modules/cs_instance.py	71.20% <0.00%> (ø)
plugins/module_utils/cloudstack.py	71.36% <0.00%> (-0.24%)	:arrow_down:

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[resmo]

@kovukono Thanks!