LP#1706147 Perl Force-Recycle drone option

LP#1706147 Perl Force-Recycle drone option

Creates an API-level option to inform the OpenSRF drone manament code
that the running drone should be recycled upon completion of the current
OpenSRF session.  This allows for quicker release of resources consumed
by the drone.

To use:

sub some_api_method {
    my ($self, $client, ...) = @_;
    $self->session->force_recycle(1);
    ...
}

Signed-off-by: Bill Erickson <berickxx@gmail.com>