XMLRPC connections opened too early

[nrueff]

When the scheduler loops on commands gathered during the "START" phase, it create deffered bounded to just-opened XMLRPC sockets; but as

• a XMLRPC socket timeout is 30 seconds,
• deffered are not taken in account until the loop is finished,

if the loop takes more than 30 secondes some XMLRPC sockets may timeout without even having been used.

[nrueff]

Altough not widely fixed, commit r.486 fixed the scheduler.

[nrueff]

Also fixed in trunk.