seccomp: defer reconnecting to the proxy

seccomp: defer reconnecting to the proxy

With the previous commit we now attempt to reconnect to the
proxy in the beginning of the notify handler if we had no
connection.
If the connection fails later on, we now don't really need
to immediately try to reconnect if we send a default
response anyway (particularly if the recv() fails). (This
also gives the proxy more time, for instance if it was just
restarted.)

Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>