QMP: Teach basic capability negotiation to python example

As sending "qmp_capabilities" on session start became mandatory, both
python examples were broken.
Signed-off-by: NJan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: NLuiz Capitulino <lcapitulino@redhat.com>

QMP/qmp-shell

@@ -42,6 +42,7 @@ def main():
 
     qemu = qmp.QEMUMonitorProtocol(argv[1])
     qemu.connect()
+    qemu.send("qmp_capabilities")
 
     print 'Connected!'
 

QMP/vm-info

@@ -24,6 +24,7 @@ def main():
 
     qemu = qmp.QEMUMonitorProtocol(argv[1])
     qemu.connect()
+    qemu.send("qmp_capabilities")
 
     for cmd in [ 'version', 'kvm', 'status', 'uuid', 'balloon' ]:
         print cmd + ': ' + str(qemu.send('query-' + cmd))