example: classifier: using agnostic function for ODP threads
example: classifier: using agnostic function for ODP threads

odp_classifier is changed to use the implementation agnostic ODP thread
create and join functions, from helpers.
odp_classifier is hence no longer aware on how the odpthread is
implemented.

Signed-off-by: Christophe Milard <99616a981fa4477cda708a70f78076761c0c9f1c@linaro.org>
Reviewed-by: Brian Brooks <8e906ed46ccdc37d68771658f0f8f8740a374927@linaro.org>
Signed-off-by: Maxim Uvarov <db4d16e02ae2d7493db430203537da8b2e34f290@linaro.org>

ravineet-singh/odp,nmorey/odp,mike-holmes-linaro/odp,nmorey/odp,dkrot/odp,erachmi/odp,nmorey/odp,erachmi/odp,erachmi/odp,ravineet-singh/odp,mike-holmes-linaro/odp,mike-holmes-linaro/odp,ravineet-singh/odp,mike-holmes-linaro/odp,dkrot/odp,nmorey/odp,ravineet-singh/odp,dkrot/odp,erachmi/odp,dkrot/odp