Remove host from auth header

[fronzbot]

Description:

Removes host from auth header (separate from 0.15.1 bugfix due to refactored code)

Related issue (if applicable): fixes #329

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 #331 into dev will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##              dev     #331   +/-   ##
=======================================
  Coverage   82.90%   82.90%           
=======================================
  Files           8        8           
  Lines         936      936           
=======================================
  Hits          776      776           
  Misses        160      160           

Flag	Coverage Δ
#unittests	82.90% <100.00%> (ø)

Impacted Files	Coverage Δ
blinkpy/auth.py	95.10% <100.00%> (ø)
blinkpy/helpers/constants.py	100.00% <100.00%> (ø)

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