tools: fix more frr-reload vrf static errors

tools: fix more frr-reload vrf static errors

Reported that in certain config changes, a static intended for the
default table would be duplicated into a vrf context.  Determined
that we still weren't keeping or adding the exit-vrf command when
necessary to keep the contexts straight.  Added logic to look for
the failing circumstances and add or remove the delete of the
exit-vrf command as needed.

Signed-off-by: Don Slice <dslice@nvidia.com>