Docs: Added workaround for testing on RedHat OSs

[nishakm]

Since Scancode binaries are built on Debian based machines, and the
prebuilt dependencies are named differently on RedHat based machines
py.test will not be able to find the libbz2.so library on those
machines.
See https://github.com/nexB/scancode-toolkit/issues/443

Added a note about how to work around this issue by symbolically
linking the existing libbz2.so on the filesystem to the expected
name.

This should be removed once
#469 is solved

Signed-off-by: Nisha K nishak@vmware.com

[codecov]

Codecov Report

Merging #883 into develop will increase coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #883      +/-   ##
===========================================
+ Coverage    79.06%   79.08%   +0.01%     
===========================================
  Files           93       93              
  Lines        11456    11456              
===========================================
+ Hits          9058     9060       +2     
+ Misses        2398     2396       -2

Impacted Files	Coverage Δ
src/scancode/api.py	77.24% <0%> (+1.19%)	⬆️

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[nishakm]

@pombredanne can you review this?

Questions I have about this PR:

1. Do I need to add my name to AUTHORS.rst?
2. Where do I put results from py.test? (This is just a change in docs so I am not sure if this is necessary for this PR)
3. Do I need to add something about this change in CHANGELOG.rst?

Thanks!

[pombredanne]

Thanks. And sorry for the delay

Do I need to add my name to AUTHORS.rst?

Sure thing. This is a small PR though, so your call

Where do I put results from py.test? (This is just a change in docs so I am not sure if this is necessary for this PR)

They are run automatically as you can see above

Do I need to add something about this change in CHANGELOG.rst?

not for a small change like this

[pombredanne]

LGTM. Merging!

[pombredanne]

Thanks again.