Changed the default gvmd socket path

[y0urself]

This should be the path to the unix socket in normal circumstances. But it must not be correct (as gvmd uses the CMAKE_INSTALL_PREFIX in the path to the socket ...)

Checklist:

• Tests
• CHANGELOG Entry
• Documentation

[codecov]

Codecov Report

Merging #162 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #162   +/-   ##
=======================================
  Coverage   91.33%   91.33%           
=======================================
  Files          12       12           
  Lines        1015     1015           
=======================================
  Hits          927      927           
  Misses         88       88

Impacted Files	Coverage Δ
gvm/connections.py	56.77% <100%> (ø)	⬆️

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[bjoernricks]

Please add a changelog entry in the Changed category like

• Changed the default unix domain socket path to /var/run/gvmd.sock