Match EIPs against DNS names and expose the latter in entity

[avaczi]

otherwise the postgresql_database entities won't work. Comes with tests.

[codecov[bot]]

Codecov Report

Merging #127 into master will increase coverage by 0.49%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #127      +/-   ##
==========================================
+ Coverage   76.69%   77.19%   +0.49%     
==========================================
  Files           6        6              
  Lines         824      842      +18     
==========================================
+ Hits          632      650      +18     
  Misses        192      192

Impacted Files	Coverage Δ
zmon_aws_agent/postgresql.py	84.37% <100%> (+2.55%)	:arrow_up:

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[mohabusama]

👍

[avaczi]

:+1:

[mohabusama]

Please resolve the conflicts - merging master should bring in OpenTracing support.

[avaczi]

:+1:

[avaczi]

:+1:

[mohabusama]

👍