Misc fixes

[simondeziel]

Most notable changes:

• use proper path to TLS client certificate/key when using the snap
• opportunistic TLS server verification attempted by looking around for a server cert with a matching name

[stgraber]

would reformat /home/runner/work/pylxd/pylxd/integration/test_projects.py

[codecov-commenter]

Codecov Report

Merging #505 (e6669c1) into master (48d1a8c) will decrease coverage by 0.02%. The diff coverage is 88.88%.

@@            Coverage Diff             @@
##           master     #505      +/-   ##
==========================================
- Coverage   97.07%   97.05%   -0.03%     
==========================================
  Files          56       56              
  Lines        4101     4105       +4     
==========================================
+ Hits         3981     3984       +3     
- Misses        120      121       +1     

Impacted Files	Coverage Δ
pylxd/tests/test_client.py	100.00% <ø> (ø)
pylxd/client.py	89.86% <88.88%> (-0.23%)	:arrow_down:

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