Fix compilation for Centos 7 removing 'auto' reference

Fix compilation for GCC 4.8.5, compiler is not being able to either
handle reference initialization using brace-enclosed initializer lists.

tag version 3.0.1 at the beginning of the development cycle

Merge pull request #4680 from sysown/v3.0-postgres_monitor_poc

Initial POC for PostgreSQL monitoring support

tag version 2.7.2 at the beginning of the development cycle

Initial 3.0.0 commit

Merge pull request #4662 from sysown/v2.7_dns_cache_fixes

DNS record will be removed if MySQL connection fails or times out for a specific hostname [v2.7]

Merge pull request #4662 from sysown/v2.7_dns_cache_fixes

DNS record will be removed if MySQL connection fails or times out for a specific hostname [v2.7]

tag version 2.6.6 at the beginning of the development cycle

tag version 2.7.1 at the beginning of the development cycle

tag version to 2.7.0 at the beginning of the development cycle