[qca-nss-clients] Fix for priority value and display message.

1. Disallow the invalid priority value in match rule addition.
2. Display the correct message, in case of rule addition failure.

Change-Id: I1ed51a4001df6f73af5ced22b8e2006230dddd80
Signed-off-by: Suruchi Suman <surusuma@codeaurora.org>
3 files changed