vtysh: Don't attempt to reconnect the non-instanced ospf process

vtysh: Don't attempt to reconnect the non-instanced ospf process

When running ospf instances we should not attempt to reconnect
the default ospf instance on running a command.

This commit should be targeted enough because in the case
of normal operation we connect to everything we should
and only set the VTYSH_WAS_ACTIVE flag for those we
truly have lost connection too.

Before:

donna.cumulusnetworks.com# config t
donna.cumulusnetworks.com(config)# router ospf 100
Warning: connecting to ospfd...failed!
donna.cumulusnetworks.com(config-router)#

After:
donna.cumulusnetworks.com# conf t
donna.cumulusnetworks.com(config)# router ospf 100
donna.cumulusnetworks.com(config-router)# end
donna.cumulusnetworks.com#

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>