opkg: ignore result of opkg configure

opkg: ignore result of opkg configure

Some packages may return error while running opkg-cl configure, during
first boot. This will fail 'ExecStart' and 'ExecStartPost' will not run.
Without 'ExecStartPost' opkg-configure service will continue to run on
successive boot attempts. 'ExecStartPost' should disable this service
after first boot irrespective of 'ExecStart' status.

(From OE-Core rev: cd6041071ddf76693cda7632379ceddd1d21a7fb)

Signed-off-by: Muhammad Shakeel <muhammad_shakeel@mentor.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>