stop_requested_ flag clearing fix

[parunapu]

Description

This PR is for a fix in moveit_servo with regards to clearing the stop_request_ flag. There were some situations where after a move was complete and the reset on the flag was called, another thread called stopMotion() again and set the flag back to 1. This prevents any bugginess by assuring that stop_requested_ starts out as false whenever moveToPose is called.

Checklist

• Required by CI: Code is auto formatted using clang-format
• Extend the tutorials / documentation reference
• Document API changes relevant to the user in the MIGRATION.md notes
• Create tests, which fail without this PR reference
• Include a screenshot if changing a GUI
• While waiting for someone to review your request, please help review another open pull request to support the maintainers

[welcome]

Thanks for helping in improving MoveIt and open source robotics!

[AndyZe]

Thanks! I was involved in testing this, so it looks good to me.

[codecov]

Codecov Report

Merging #2537 (2ac8321) into master (30a170f) will increase coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2537      +/-   ##
==========================================
+ Coverage   60.20%   60.23%   +0.04%     
==========================================
  Files         351      351              
  Lines       26485    26485              
==========================================
+ Hits        15942    15951       +9     
+ Misses      10543    10534       -9     

Impacted Files	Coverage Δ
moveit_ros/moveit_servo/src/pose_tracking.cpp	46.11% <ø> (ø)
...ipulation/pick_place/src/manipulation_pipeline.cpp	73.41% <0.00%> (+1.07%)	⬆️
...meterization/work_space/pose_model_state_space.cpp	84.56% <0.00%> (+1.48%)	⬆️
.../ompl_interface/src/detail/constrained_sampler.cpp	60.00% <0.00%> (+17.15%)	⬆️

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[welcome]

Congrats on getting your first MoveIt pull request merged and improving open source robotics!