staticd: Avoid requesting SRv6 sid from zebra when loc and sid block dont match

staticd: Avoid requesting SRv6 sid from zebra when loc and sid block dont match

Currently, when the locator block and sid block differs, staticd would
still go ahead and request zebra to allocate the SID which it does if
there is atleast one match (from any locators).

Only when staticd tries to install the route, it sees that the locator
block and sid block are different and avoids installing the route.

Fix:
Check if the locator block and sid block match before even requesting
Zebra to allocate one.

Signed-off-by: Rajasekar Raja <rajasekarr@nvidia.com>