mod_posix: Move everything to util.startup
This allows greater control over the order of events.
Notably, the internal ordering between daemonization, initialization of
libunbound and setup of signal handling is sensitive.
libunbound starts a separate thread for processing DNS requests.
If this thread is started before signal handling has been set up, it
will not inherit the signal handlers and instead behave as it would have
before signal handlers were set up, i.e. cause the whole process to
immediately exit.
libunbound is usually initialized on the first DNS request, usually
triggered by an outgoing s2s connection attempt.
If daemonization happens before signals have been set up, signals may
not be processed at all.
# Publishing a nickname in PEP and receiving a notification
[Client] Romeo
jid: romeo@localhost
password: password
-----
Romeo connects
Romeo sends:
<iq id="4" type="set">
<pubsub xmlns="http://jabber.org/protocol/pubsub">
<publish node="http://jabber.org/protocol/nick">
<item id="current">
<nickname xmlns="http://jabber.org/protocol/nick"/>
</item>
</publish>
</pubsub>
</iq>
Romeo receives:
<iq id="4" type="result">
<pubsub xmlns="http://jabber.org/protocol/pubsub">
<publish node="http://jabber.org/protocol/nick">
<item id="current"/>
</publish>
</pubsub>
</iq>
Romeo sends:
<presence>
<c xmlns="http://jabber.org/protocol/caps" hash="sha-1" node="http://code.matthewwild.co.uk/clix/" ver="jC32N+FhQoLrZ7nNQtZK3aqR0Fk="/>
</presence>
Romeo receives:
<iq id="disco" from="romeo@localhost" type="get">
<query xmlns="http://jabber.org/protocol/disco#info" node="http://code.matthewwild.co.uk/clix/#jC32N+FhQoLrZ7nNQtZK3aqR0Fk="/>
</iq>
Romeo receives:
<presence>
<c xmlns="http://jabber.org/protocol/caps" hash="sha-1" node="http://code.matthewwild.co.uk/clix/" ver="jC32N+FhQoLrZ7nNQtZK3aqR0Fk="/>
</presence>
Romeo sends:
<iq id="disco" type="result" to="romeo@localhost">
<query xmlns="http://jabber.org/protocol/disco#info" node="http://code.matthewwild.co.uk/clix/#jC32N+FhQoLrZ7nNQtZK3aqR0Fk=">
<identity type="console" name="clix" category="client"/>
<feature var="http://jabber.org/protocol/disco#items"/>
<feature var="http://jabber.org/protocol/disco#info"/>
<feature var="http://jabber.org/protocol/caps"/>
<feature var="http://jabber.org/protocol/nick+notify"/>
</query>
</iq>
Romeo receives:
<message type="headline" from="romeo@localhost">
<event xmlns="http://jabber.org/protocol/pubsub#event">
<items node="http://jabber.org/protocol/nick">
<item id="current">
<nickname xmlns="http://jabber.org/protocol/nick"/>
</item>
</items>
</event>
</message>
Romeo sends:
<presence type="unavailable"/>
Romeo disconnects