Misc doorbell fixes

[jeffothy]

Description:

1. Network ID for doorbell accessed via sync object
2. String split and join for protocol replacement swallows the port colo (i.e. "immis://host:port/path" changes to "rtsps://hostport/path") so use a more explicit replacement instead.

Checklist:

• Local tests with tox run successfully PR cannot be meged unless tests pass
• Changes tested locally to ensure platform still works as intended
• Tests added to verify new code works

[codecov]

Codecov Report

Merging #623 (c401965) into dev (1a75592) will decrease coverage by 0.02%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##              dev     #623      +/-   ##
==========================================
- Coverage   86.84%   86.81%   -0.03%     
==========================================
  Files           8        8              
  Lines        1064     1062       -2     
==========================================
- Hits          924      922       -2     
  Misses        140      140              

Flag	Coverage Δ
unittests	86.81% <66.66%> (-0.03%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
blinkpy/camera.py	84.26% <66.66%> (-0.16%)	⬇️

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[fronzbot]

Looks good, thanks for the PR!