Merged
requested to merge fix/5.1_sip_address_table_creation_refused_utf8mb4_mariadb5.5 into release/5.1
Fix sip address table creation when database connection string containts utf8mb4 as charset, on mariadb 5.5 (mitigates Exception while creating or updating the database's schema : Specified key was too long; max key length is 767 bytes while executing) Added warning comments in case utf8mb4 varchar columns > 255 were to be indexed