Don't specify program name in passive connection man page fragments.

The vconn and ovsdb passive connection man page fragments used the
PN (program name) macro to describe their functionality.  This was
usually correct, but in the case of ovs-vsctl, they may be used to
describe configuring ovs-vswitchd.  This commit rewords the fragments to
make them correct regardless of whether they're describing a local or
remote passive connection.

Signed-off-by: Justin Pettit <jpettit@nicira.com>