fix for issue with slave agent check
fixed agent check in case Slave_running key is not found
made the logic for the Slave_running determination a bit cleaner
Enable autocommit in psycopg2 connection to get actual values
Merge pull request #764 from DataDog/mysql-check-fix

Mysql check fix
Bump version to 4.0.1
Merge branch 'v4.0.x_stable' of github.com:DataDog/dd-agent into v4.0.x_stable
Break ternary condition for 2.4 compatibility
Do not allow dd-agent user to shell in
Remove dd-agent user and group on uninstall
varnish: log the command that was run on failure
varnish: actually use tags given in yaml
varnish: allow multiple instances (fixes #490)
update varnish name tag to be more specific
Turn ssl validation of http_check into an option

Fixes #770.
Merge from master.
Revert source install `set -e`
set a default varnish_name tag if unspecified
#768 dd-agent is not part of any group on debian
Vagrant VM for development
Add a centos test box