add another file to detect platform type

Amazon Linux distributions may not include a redhat-release file.
Update CHANGELOG according to Docker changes
Merge pull request #1186 from DataDog/miketheman/amazon_linux_detect

add another file to detect platform type
Log in debug if ignore denied access is true

Fix #866
Do not use autocommit mode

Fix #1172
Do not send password as a tag

Fix #1168
Fixing cassandra mirror and use latest cassandra version
Update postgres.py
Fix cassandra directory
Fix header conflict

Fix #542
Do not display warning about ssl certificate validation being disabled if not using https

And add a test for that
Fix #1195
Test the headers
Merge pull request #1197 from DataDog/fix_http_check

Fix http check
Fix nagios default configuration
Add service check to elastic search for connectivity
Small fixes as per Conor's comments
Fix spacing
Disable tagging by hostname by default for HAProxy service check.

In general you care about a {backend,service} combination but not the
HAProxy host itself. With tagging by host, the default setup for an
HAProxy monitor will trigger N errors everytime a backend goes down,
where N is the number of haproxy load balancers.

This will make things less noisy but keeps an option to enable the
tagging by hostname if you would like it.

I also updated the formatting on the YAML file to match the HTTP
check so it's more readable/clear.
Forgot a self
Forgot a self