bitbake: bb/server/process: Handle EINTR on idle_commands select

If a signal is sent like SIGWINCH the select could be interrupted
so ignore the InterruptError like in XMLRPC server [1].

[1]
http://git.yoctoproject.org/cgit/cgit.cgi/poky/tree/bitbake/lib/bb/server/xmlrpc.py#n307

(Bitbake rev: 96bb174325493764718c61c12c943c37b882cd61)

Signed-off-by: Aníbal Limón <anibal.limon@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/server/process.py

@@ -186,7 +186,12 @@ class ProcessServer(Process, BaseImplServer):
             nextsleep = self.next_heartbeat - now
 
         if nextsleep is not None:
-            select.select(fds,[],[],nextsleep)
+            try:
+                select.select(fds,[],[],nextsleep)
+            except InterruptedError:
+                # ignore EINTR error, nextsleep only used for wait
+                # certain time
+                pass
 
     def runCommand(self, command):
         """