Decrease IMA time frame

[badrogger]

Changes:

• Added migration for IMA time frame option in a same way the ima-agent was migrated during 2.2 release.

Tests:

• Added new unit test. Fixed existing ones.
• Tested on local network.

Performance:

• No performance changes were introduced.

New time frame is configured using static_params.yaml (time_frame) config file.
Migration timestamp is configured in ima_migration_timestamp.yaml config file

[codecov]

Codecov Report

Attention: Patch coverage is 91.52542% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 81.65%. Comparing base (13a95c1) to head (3dcc197).

Files	Patch %	Lines
tools/docker_utils.py	72.72%	3 Missing ⚠️
core/schains/ima.py	86.66%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           v2.7.x    #1069      +/-   ##
==========================================
+ Coverage   81.57%   81.65%   +0.07%     
==========================================
  Files         103      103              
  Lines        5916     5946      +30     
==========================================
+ Hits         4826     4855      +29     
- Misses       1090     1091       +1     

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