Fix bullet plugin library path name

[captain-yoshi]

Description

Fix wrong plugin library path for the Bullet collision detector.

Exception while loading Bullet: Could not find library corresponding to plugin Bullet. Make sure the plugin description XML file has the correct name of the library and that the library actually exists.

[codecov]

Codecov Report

Merging #2783 (fb89392) into master (a27e5d1) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2783      +/-   ##
==========================================
- Coverage   60.48%   60.46%   -0.01%     
==========================================
  Files         366      366              
  Lines       31654    31654              
==========================================
- Hits        19142    19138       -4     
- Misses      12512    12516       +4     

Impacted Files	Coverage Δ
.../ompl_interface/src/detail/constrained_sampler.cpp	43.25% <0.00%> (-16.21%)	⬇️
...meterization/work_space/pose_model_state_space.cpp	81.14% <0.00%> (-1.88%)	⬇️
...g_scene_interface/src/planning_scene_interface.cpp	47.46% <0.00%> (-1.12%)	⬇️
...nning_scene_monitor/src/planning_scene_monitor.cpp	68.27% <0.00%> (+0.14%)	⬆️
...raint_samplers/src/default_constraint_samplers.cpp	80.72% <0.00%> (+0.30%)	⬆️
...ipulation/pick_place/src/manipulation_pipeline.cpp	72.23% <0.00%> (+0.93%)	⬆️
..._interface/src/detail/constrained_goal_sampler.cpp	76.00% <0.00%> (+2.00%)	⬆️
...eit_ros/manipulation/pick_place/src/pick_place.cpp	92.64% <0.00%> (+3.16%)	⬆️

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[rhaschke]

Don't we have a unit test using the bullet collision???

[captain-yoshi]

Yes there is but, to my knowledge, there are no test using bullet through the collision_detection::CollisionPlugin. I think it's the same for FCL.

This PR from reach added a test for the same issue. It could give ideas on how to create a test for Bullet and FCL through the plugin. Maybe MoveIt has already tests that uses a plugin (Kinematics, planning).

[rhaschke]

I suggest adapting the existing tests to load the collision library via the plugin mechanism.