crimson/osd: fix missed OpSequencer::abort() on primary change.

Commit b5efdc6f1c has unified
the interruption handling among `InternalClientRequest` and
`ClientRequest`. Unfortunately, a call to `abort()` of
`OpSequencer` has been overlooked and dropped. This was causing
crashes at Sepia after after fixing the ordering issues in
`ClientRequest`.

Signed-off-by: Radoslaw Zarzynski <rzarzyns@redhat.com>

src/crimson/osd/osd_operations/client_request.cc

@@ -125,6 +125,7 @@ seastar::future<> ClientRequest::start()
           });
 	}, [this, pgref](std::exception_ptr eptr) {
           if (should_abort_request(*this, std::move(eptr))) {
+            sequencer.abort();
             return seastar::stop_iteration::yes;
           } else {
             sequencer.maybe_reset(*this);