Update build scripts for uploading dartpy to PyPI

[jslee02]

dartpy is not available on PyPI.

Installation on Ubuntu:

# Required dependencies
sudo apt-get install build-essential cmake pkg-config git
sudo apt-get install libeigen3-dev libassimp-dev libccd-dev libfcl-dev libboost-regex-dev libboost-system-dev
sudo apt-get install libtinyxml2-dev liburdfdom-dev
sudo apt-get install libxi-dev libxmu-dev freeglut3-dev libopenscenegraph-dev

# Optional dependencies
sudo apt-get install libbullet-dev libode-dev liboctomap-dev
# Ubuntu 16.04 and 18.04
sudo apt-get install libnlopt-dev
# Ubuntu 18.10 and later
sudo apt-get install libnlopt-cxx-dev

pip3 install dartpy

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Before creating a pull request

• Document new methods and classes
• Format new code files using clang-format

Before merging a pull request

• Set version target by selecting a milestone on the right side
• Summarize this change in CHANGELOG.md

[codecov]

Codecov Report

Merging #1341 into release-6.9 will increase coverage by 0.01%.
The diff coverage is 28.57%.

@@               Coverage Diff               @@
##           release-6.9    #1341      +/-   ##
===============================================
+ Coverage        56.88%   56.89%   +0.01%     
===============================================
  Files              366      366              
  Lines            27173    27174       +1     
===============================================
+ Hits             15457    15461       +4     
+ Misses           11716    11713       -3

Impacted Files	Coverage Δ
dart/lcpsolver/ODELCPSolver.cpp	0% <0%> (ø)	⬆️
dart/constraint/DantzigLCPSolver.cpp	0% <0%> (ø)	⬆️
dart/constraint/PgsBoxedLcpSolver.cpp	70.09% <0%> (ø)	⬆️
dart/constraint/DantzigBoxedLcpSolver.cpp	30% <100%> (+7.77%)	⬆️
dart/dynamics/Skeleton.cpp	66.12% <0%> (+0.16%)	⬆️