Read the configuration without locking it
Read the configuration without locking it

As reads to the config are consistent anyway (changes go in
by a single change to WConfD), do not acquire the config lock
for read-only operations. To keep the transition smooth, this
read without locking is built into the config manager as the
new "shared" synchronisation.

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

leshchevds/ganeti,onponomarev/ganeti,andir/ganeti,bitemyapp/ganeti,ganeti/ganeti,ganeti/ganeti,dimara/ganeti,mbakke/ganeti,andir/ganeti,andir/ganeti,mbakke/ganeti,apyrgio/ganeti,ganeti-github-testing/ganeti-test-1,ganeti-github-testing/ganeti-test-1,bitemyapp/ganeti,grnet/snf-ganeti,mbakke/ganeti,onponomarev/ganeti,dimara/ganeti,ganeti/ganeti,grnet/snf-ganeti,leshchevds/ganeti,leshchevds/ganeti,apyrgio/ganeti,yiannist/ganeti,yiannist/ganeti,yiannist/ganeti