New audiod command: ll to change the log level at runtime.

New audiod command: ll to change the log level at runtime.

The new public daemon_get_loglevel() is needed in the zero argument
case. Otherwise, the ll command handler parses the argument and calls
daemon_set_loglevel().

The lopsub stanza for the subcommand is stored in a separate file
which is currently only included by the lopsub suite for para_audiod,
but will be included as well by the server suite.

For similar reasons we implement the completer as a generic public
function, i9e_ll_completer(), although it only has one caller in
audioc.c. Another caller follows when the ll server command is added.