Remove all useless dependencies
Remove all useless dependencies

pexpect has been useless since onos testcases were removed [1]

[1] https://gerrit.opnfv.org/gerrit/#/c/40229/

Change-Id: I9de88ee56e44518568d6562d9cf639b9bf7be562
Signed-off-by: Cédric Ollivier <d48310251a4a484d041bc5d09a9ac4d86d20f793@orange.com>

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