[prosody-dev] [PATCH] Prosody modules: mod_auth_sql: Support for setting SQL queries from the configuration file

[senya]

This patch adds configuration options `password_sql_query` and
`usernames_sql_query` which can be used for
setting arbitrary SQL query to retrieve users list or password instead
of the hard coded values.
The new configuration options are expected to be string with an SQL
query. The options support
special sequences %h and %u which are substituted with host name and
user name respectively
in the query before execution.