Bump RPC protocol version to 40

Many RPC calls have changed in Ganeti 2.2, hence bumping the RPC protocol
version.

Signed-off-by: Michael Hanselmann <hansmi@google.com>
Reviewed-by: Guido Trotter <ultrotter@google.com>

lib/constants.py

@@ -26,7 +26,7 @@ import re
 from ganeti import _autoconf
 
 # various versions
-PROTOCOL_VERSION = 30
+PROTOCOL_VERSION = 40
 RELEASE_VERSION = _autoconf.PACKAGE_VERSION
 OS_API_V10 = 10
 OS_API_V15 = 15