Resolve encoding problem found by attempting to register patrons with Unicode names

Resolve encoding problem found by attempting to register patrons with Unicode names

Symptoms were:

1. a gateway.log entry showing http_translator receiving an XMPP error message
2. a corresponding osrfsys.log entry "server: died with error Wide character in syswrite at /usr/local/share/perl5/OpenSRF/Server.pm line 239"

Per normal Perl Unicode handling practices, decoding input and encoding output
using the Encode module and decode_utf8() / encode_utf8() appears to resolve
the problem.

git-svn-id: svn://svn.open-ils.org/OpenSRF/branches/rel_2_0@2169 9efc2488-bf62-4759-914b-345cdb29e865