Fix issue 45

[rvalle]

it is possible to register a template for all zones, but not to extract it.

A minor PR to display a warning in that particular case:

TASK [Wait for Template Registration] ******************************************************************************************
changed: [manager] => (item=debian-9-x86_64)
[WARNING]: cross_zones parameter is ignored when state is extracted

[codecov[bot]]

Codecov Report

Merging #46 (49b41b0) into master (b460745) will decrease coverage by 0.04%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #46      +/-   ##
==========================================
- Coverage   84.42%   84.37%   -0.05%     
==========================================
  Files          53       53              
  Lines        5510     5512       +2     
  Branches     1246     1247       +1     
==========================================
- Hits         4652     4651       -1     
- Misses        428      432       +4     
+ Partials      430      429       -1     

Impacted Files	Coverage Δ
...ngine_io/cloudstack/plugins/modules/cs_template.py	59.77% <0.00%> (-0.70%)	:arrow_down:
...e_io/cloudstack/plugins/module_utils/cloudstack.py	72.58% <0.00%> (-0.23%)	:arrow_down:

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[resmo]

Thanks!