provide API to get other robot clients

[zaibon]

This api provide an unified way to get othe robot client from within a template. It uses a queue to serialize the access to the low level configuration to ensure that we don't have data race if a template tries to modify the robot client configuration

All the templates that was dealing with robot client manually will have to be updated to use this api

[codecov-io]

Codecov Report

Merging #45 into development will increase coverage by <1%. The diff coverage is 83%.

@@             Coverage Diff             @@
##           development    #45    +/-   ##
===========================================
+ Coverage           71%    72%   +<1%     
===========================================
  Files              154    155     +1     
  Lines             6495   6522    +27     
===========================================
+ Hits              4662   4708    +46     
+ Misses            1833   1814    -19

Impacted Files	Coverage Δ
zerorobot/template/base.py	96% <100%> (ø)	:arrow_up:
zerorobot/dsl/ZeroRobotAPI.py	92% <100%> (+24%)	:arrow_up:
zerorobot/dsl/__init__.py	100% <100%> (ø)
...pscaleZrobot/clients/zerorobot/ZeroRobotFactory.py	62% <100%> (+10%)	:arrow_up:
zerorobot/service_proxy.py	82% <50%> (+8%)	:arrow_up:
zerorobot/dsl/ZeroRobotManager.py	78% <58%> (-9%)	:arrow_down:
tests/test_zrobot_api.py	91% <76%> (-3%)	:arrow_down:
zerorobot/dsl/config_mgr.py	88% <88%> (ø)
...caleZrobot/clients/zerorobot/client/http_client.py	85% <0%> (-7%)	:arrow_down:
zerorobot/server/auth/auth.py	60% <0%> (-6%)	:arrow_down:
... and 12 more

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