Use instance metadata

[vetinari]

see http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/instance-identity-documents.html ... this saves one API call

• also: add availability_zone for instances

[codecov[bot]]

Codecov Report

Merging #121 into master will decrease coverage by 0.8%. The diff coverage is 12.5%.

@@            Coverage Diff             @@
##           master     #121      +/-   ##
==========================================
- Coverage   76.33%   75.53%   -0.81%     
==========================================
  Files           6        6              
  Lines         655      654       -1     
==========================================
- Hits          500      494       -6     
- Misses        155      160       +5

Impacted Files	Coverage Δ
zmon_aws_agent/main.py	33.33% <0%> (-1.15%)	:arrow_down:
zmon_aws_agent/aws.py	89.75% <100%> (-0.14%)	:arrow_down:

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[vetinari]

:+1:

[pitr]

not needed