Reuse the right detected role name
Reuse the right detected role name

It completes "Try to get Member or member role" [1][2].

[1] https://gerrit.opnfv.org/gerrit/#/c/59661/
[2] https://build.opnfv.org/ci/view/functest/job/functest-apex-baremetal-daily-master/144/console

Change-Id: Ib38b513906b08d6f85834e03f5415e83b66b733b
Signed-off-by: Cédric Ollivier <d48310251a4a484d041bc5d09a9ac4d86d20f793@orange.com>

opnfv/functest,opnfv/functest