Clean up 0-templates

[katia-e]

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

• 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 #112 into master will increase coverage by <1%. The diff coverage is 93%.

@@          Coverage Diff           @@
##           master   #112    +/-   ##
======================================
+ Coverage      93%    93%   +<1%     
======================================
  Files          14     14            
  Lines        2150   2152     +2     
======================================
+ Hits         2012   2016     +4     
+ Misses        138    136     -2

Impacted Files	Coverage Δ
templates/node/node.py	90% <100%> (ø)	:arrow_up:
templates/vdc/vdc.py	83% <100%> (ø)	:arrow_up:
templates/account/account.py	90% <90%> (ø)	:arrow_up:
templates/node/test_node.py	94% <0%> (ø)	:arrow_up:

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[katia-e]

moved to #116