Refactor refstack to limit instructions
Refactor refstack to limit instructions

Change-Id: I3cd490d18898d0ee6f48e4c19d7ed65c0cf0c275
Signed-off-by: Cédric Ollivier <d48310251a4a484d041bc5d09a9ac4d86d20f793@orange.com>

mywulin/functest,opnfv/functest,opnfv/functest,mywulin/functest