Added device_id support via ENV variable or auto uuid values

[devilankur18]

Purpose of changes

Currently not able to set custom device id for emulator

Types of changes

Put an x in the boxes that apply

• Bug fix (non-breaking change which fixes an issue)
• [ x] New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

How has this been tested?

While launching the docker image, passing the device_id value via environmrnt variable will launch the emulator with that mentioned device_id or an auto generate UUID will be set instead.

[codecov-io]

Codecov Report

Merging #104 into master will increase coverage by 0.04%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #104      +/-   ##
==========================================
+ Coverage    98.3%   98.34%   +0.04%     
==========================================
  Files           2        2              
  Lines         118      121       +3     
==========================================
+ Hits          116      119       +3     
  Misses          2        2

Impacted Files	Coverage Δ
src/app.py	98.27% <100%> (+0.04%)	⬆️

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[budtmo]

Hi @devilankur18 ,

Thank you for the PR. it looks good to me.
Could you maybe fix a small codacy violation in this PR? so I can merge it

[SrinivasanTarget]

👍