Add support for providing additional parameters to be used when
constructing the database uri. This change adds an 'extra' parameter
which is a hash that will be joined together when constructing the
database uri. It should be noted that the charset option, which can be
provided as a standalone option, will override charset when passed in
the 'extra' parameter. This is to maintain backwards compatibility.
Usage Example:
os_database_connection({
...
extra => { 'charset' => 'utf-8', 'read_timeout' => 60 }
})
Change-Id: I7ef078b76ac6cd7bea42a0ac92b383cefd47167a
Co-Authored-By: Alex Schultz <aschultz@mirantis.com>