Document post cluster initialization LU
Document post cluster initialization LU

Update hooks documentation with the new opcode (not deleting OP_INIT_CLUSTER
from obsolete operations because the name is different).

Signed-off-by: Luca Bigliardi <e702700dc9a886e6138bb50811fbdce0772e040e@google.com>
Reviewed-by: Iustin Pop <acf83a5274f31a43af6b914614365999469c1a31@google.com>

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