isisd: keep circuit config on conf->up failure

if we are not able to bring a circuit up due to some config
issue, e.g. a low MTU compared to the area lsp-mtu, we should
not remove the configuration, as this will push out of sync
with the YANG state and create more issues down the line.
Instead, keeping the circuit state at C_STATE_CONF should be
sufficient.

For the specific case of the MTU mismatch above, this also means
that when we receive a new IF_UP_FROM_Z when the MTU is changed
we will be able to bring the circuit up as we should.

Signed-off-by: Emanuele Di Pascale <emanuele@voltanet.io>

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