Only send DEL_ONION if ADD_ONION completed successfully and the
controller has an active service ID to remove.
This avoids masking the original ADD_ONION failure with a secondary
empty DEL_ONION error during startup cleanup.
Replies may contain quoted values that include spaces, newlines and/or
escaped characters (including doublequote itself). Not accounting for
that leads to errors when e. g. `COOKIEFILE` path contains spaces.
A new method, Reconnect, is added to tor controller which can be used to
reset the current connection. This will be later used in healthcheck to
help us reset the connection to Tor Daemon.
This commit adds a new response reader which replaces the old
textproto.Reader.ReadResponse. The older reader cannot handle the case
when the reply from Tor server contains a data reply line, which uses
the symbol "+" to signal such a case.
