Fix for FACILITY transfer

[exaSR]

Fixes #35
I came upon the problem that the server part would not report the proper facility for messages.

This patch fixes the problem by

• changing the constants in SyslogUtiliites to match RFC 5424 (this fixes the decoding part)
• fixing the encoding accordingly

[CLAassistant]

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[exaSR]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
You have signed the CLA already but the status is still pending? Let us recheck it.

Feel free to manually transfer my changes. I do not feel comfortable with granting @CLAassistant the requested permissions on my account...