bitbake: bitbake-server: ensure server timeout is a float

bitbake-server is spawned by process.py and passes the arguments it is
given to ProcessServer.  There's some type confusion here:

bitbake-server is called with a string representation of the timeout,
which may be None.  If the timeout is not set, pass 0 instead of None.

Inside bitbake-server a ProcessServer is created which expects the
timeout to be a float not a string, so always float() the value.

[ YOCTO #14350 ]

(Bitbake rev: c93ae1f861208f6d39fd15c84fbcd0e2b54331f5)

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/bin/bitbake-server

@@ -26,7 +26,7 @@ readypipeinfd = int(sys.argv[3])
 logfile = sys.argv[4]
 lockname = sys.argv[5]
 sockname = sys.argv[6]
-timeout = sys.argv[7]
+timeout = float(sys.argv[7])
 xmlrpcinterface = (sys.argv[8], int(sys.argv[9]))
 if xmlrpcinterface[0] == "None":
     xmlrpcinterface = (None, xmlrpcinterface[1])