Add ROS support

[prajakta-gokhale]

• Rename Dockerfile_ros2 to Dockerfile_ros
• Rename CLI argument --distro to --rosdistro
• Reword documentation and variables from ros2 to ros
• Add ROS build support in emulated build
• Add logic to use correct base docker images for supported ROS distros

Signed-off-by: Prajakta Gokhale prajaktg@amazon.com

[codecov[bot]]

Codecov Report

Merging #90 into master will increase coverage by 3.17%. The diff coverage is 92.5%.

@@            Coverage Diff             @@
##           master      #90      +/-   ##
==========================================
+ Coverage   66.52%   69.69%   +3.17%     
==========================================
  Files           4        4              
  Lines         236      264      +28     
==========================================
+ Hits          157      184      +27     
- Misses         79       80       +1

Flag	Coverage Δ
#unittests	69.69% <92.5%> (+3.17%)	:arrow_up:

Impacted Files	Coverage Δ
cross_compile/ros2_cross_compile.py	0% <0%> (ø)	:arrow_up:
test/test_sysroot_compiler.py	100% <100%> (ø)	:arrow_up:
cross_compile/sysroot_compiler.py	69.11% <84.61%> (+0.65%)	:arrow_up:

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