Add note for converting Neutron database tables to UTF-8

Some distributions use the latin1 charset by default, and will require
conversion to UTF-8, due to later database migration scripts specifying
the UTF-8 charset in table creation.

Change-Id: I415114d84fbaa830dfa60964725d0f2b5db1017c
Closes-Bug: #1340311
Co-Authored-By: Matthew Kassawara <mkassawara@gmail.com>
Merge "Add note for converting Neutron database tables to UTF-8"