FIX: Interface up handling

FIX: Interface up handling

- Increase timeout when trying to check interface (this is useful if
there are multiple interfaces and dump command take more than
TIMEOUT/NR_IF which is happening quite often).
- Reverse the order of applying MTU and interface UP to try to prevent
API overload during interface initialization phase.

Change-Id: I4e8623963d15b3c0d202172b4c58c43a972bb9cb
Signed-off-by: Peter Mikus <pmikus@cisco.com>
(cherry picked from commit 584345da4f7330f7517e5defd894b4995c2b57b0)