server: ensure persistent connections to tor addrs are made if active
server: ensure persistent connections to tor addrs are made if active

In this commit, we restrict the persistent connection logic on startup
to only attempt to establish connections to Tor addresses if Tor
outbound support is enabled. Otherwise, we'll continually attempt to
reach the address even though we never will.

LightningNetwork/lnd,aakselrod/lnd,LightningNetwork/lnd,aakselrod/lnd