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: 95cc877f3bf5ef2513d7af0ae424f78ec7c24f7d)

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit c93ae1f861208f6d39fd15c84fbcd0e2b54331f5)
Signed-off-by: Anuj Mittal <anuj.mittal@intel.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])

bitbake/lib/bb/server/process.py

@@ -509,7 +509,7 @@ class BitBakeServer(object):
         os.set_inheritable(self.bitbake_lock.fileno(), True)
         os.set_inheritable(self.readypipein, True)
         serverscript = os.path.realpath(os.path.dirname(__file__) + "/../../../bin/bitbake-server")
-        os.execl(sys.executable, "bitbake-server", serverscript, "decafbad", str(self.bitbake_lock.fileno()), str(self.readypipein), self.logfile, self.bitbake_lock.name, self.sockname,  str(self.server_timeout), str(self.xmlrpcinterface[0]), str(self.xmlrpcinterface[1]))
+        os.execl(sys.executable, "bitbake-server", serverscript, "decafbad", str(self.bitbake_lock.fileno()), str(self.readypipein), self.logfile, self.bitbake_lock.name, self.sockname,  str(self.server_timeout or 0), str(self.xmlrpcinterface[0]), str(self.xmlrpcinterface[1]))
 
 def execServer(lockfd, readypipeinfd, lockname, sockname, server_timeout, xmlrpcinterface):