Apply modifications done in OPNFV functest project
It synchronises the robotframework files testing neutron resources
between ODL and OPNFV functest. It mainly replaces deprecated keywords
[1], removes unused librairies [2] and fixes minor typos [3].
[1] https://gerrit.opnfv.org/gerrit/#/c/15627/
[2] https://gerrit.opnfv.org/gerrit/#/c/15535/
[3] https://gerrit.opnfv.org/gerrit/#/c/15083/
Change-Id: I183115b50643a7fe03b23cfdd8676f7e9643481f
Signed-off-by: Cédric Ollivier <ollivier.cedric@gmail.com>