zebra: Notify all daemons about locator delete

zebra: Notify all daemons about locator delete

Currently, when a locator is deleted in zebra, zebra notifies only the
zclient that owns the locator.

With the introduction of SID Manager, the locator is no longer owned by
any client. Instead, the locator is owned by Zebra, and clients can
allocate and release SIDs from the locator using the ZAPI
ZEBRA_SRV6_MANAGER_GET_SID and ZEBRA_SRV6_MANAGER_RELEASE_SID.

Therefore, when a locator is removed in Zebra, we need to notify all
daemons so that they can release/uninstall the SIDs allocated by that
locator.

Signed-off-by: Carmine Scarpitta <cscarpit@cisco.com>