Add a utility to run an Rpc call in a new WConfD client
Add a utility to run an Rpc call in a new WConfD client

...that takes care of creating and closing the client
properly.

Signed-off-by: Klaus Aehlig <4ce51de36d9068cd7db2eec1151e0f3f95419008@google.com>
Reviewed-by: Petr Pudlak <9d19625f8ee825a2c398462ed335cbcf98f79c32@google.com>

leshchevds/ganeti,onponomarev/ganeti,ganeti/ganeti,ganeti/ganeti,mbakke/ganeti,andir/ganeti,ganeti/ganeti,onponomarev/ganeti,mbakke/ganeti,bitemyapp/ganeti,leshchevds/ganeti,mbakke/ganeti,grnet/snf-ganeti,andir/ganeti,bitemyapp/ganeti,andir/ganeti,grnet/snf-ganeti,leshchevds/ganeti