Cleanup

[katia-e]

closes #110 closes #100 closes #101 - fixes comment related to tests closes #83 - fixes remaining bullet points closes #114

• add retry decorators to install actions.
• fix logic of uninstall actions: can't uninstall account and vdc if not empty
• add missing checks
• define methods _execute_task and _get_proxy for each template to avoid repeating code checking status of tasks and success of finding a service.
• define get_info method for each template. Method returns dict of service private info that can be requested by other services. Method is substitution for methods like get_name, get_id etc, present in the code before.

[codecov-io]

Codecov Report

Merging #116 into master will increase coverage by 1%. The diff coverage is 96%.

@@          Coverage Diff           @@
##           master   #116    +/-   ##
======================================
+ Coverage      93%    94%    +1%     
======================================
  Files          14     14            
  Lines        2150   1909   -241     
======================================
- Hits         2012   1812   -200     
+ Misses        138     97    -41

Impacted Files	Coverage Δ
templates/openvcloud/test_openvcloud.py	100% <100%> (ø)	:arrow_up:
templates/sshkey/sshkey.py	78% <100%> (ø)	:arrow_up:
templates/sshkey/test_sshkey.py	100% <100%> (ø)	:arrow_up:
templates/vdcuser/test_vdcuser.py	100% <100%> (ø)	:arrow_up:
templates/account/test_account.py	100% <100%> (+3%)	:arrow_up:
templates/disk/disk.py	96% <100%> (+5%)	:arrow_up:
templates/openvcloud/openvcloud.py	92% <50%> (ø)	:arrow_up:
templates/node/node.py	85% <82%> (-5%)	:arrow_down:
templates/vdc/vdc.py	83% <85%> (ø)	:arrow_up:
templates/vdcuser/vdcuser.py	91% <88%> (ø)	:arrow_up:
... and 11 more

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