Added 2 new syslog message match definition files (for postfix and procmail), and the related events definition files.

Cyrille Bollu
Merge branch 'new-syslog-msg' into develop
XML formatting

- Verified XML is valid
- Normalized XML format
XML formatting

- Verified if XML is valid
- Formatting and normalizing with xmllint --format
XML formatting

- Verified XML is valid
- Normalized XML format with xmllint --format
XML formatting

- Verified valid XML
- Normalized XML formatting with xmllint --format