Introducing setting scope (local/global)

[DenysGonchar]

added scope for configuration parameters.
• global parameters can be set on master node only, also they are automatically propagated to the slave nodes.
• local paramteres can be set per node.

also fixed amoc_throttle:stop() for throttles with gradually changing rates

[codecov-commenter]

Codecov Report

❌ Patch coverage is 66.00000% with 17 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.01%. Comparing base (97fb8ca) to head (890a7c5).

Files with missing lines	Patch %	Lines
src/amoc_controller.erl	44.44%	5 Missing ⚠️
src/dist/amoc_dist.erl	0.00%	5 Missing ⚠️
src/config/amoc_config_scenario.erl	90.00%	2 Missing ⚠️
src/config/amoc_config_verification.erl	66.66%	2 Missing ⚠️
src/throttle/amoc_throttle_controller.erl	66.66%	2 Missing ⚠️
src/config/amoc_config_attributes.erl	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #197      +/-   ##
==========================================
+ Coverage   76.81%   77.01%   +0.20%     
==========================================
  Files          32       32              
  Lines        1169     1201      +32     
==========================================
+ Hits          898      925      +27     
- Misses        271      276       +5     

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