Backport: Use EXTRA_VERSION_NAME and EXTRA_VERSION_DESCRIPTION

Backport: Use EXTRA_VERSION_NAME and EXTRA_VERSION_DESCRIPTION

Backport:
    For sessiond add the sessiond_config_log function for verbose
    Printing of the version since config-sessiond does not exist in 2.9.
===

Add detailed version information to the debug log of lttng-relayd and
lttng-sessiond.

Append the extra version information at the end of the "version" command
of the lttng binary.

Signed-off-by: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>