Get rid of easy_install in unit test
Get rid of easy_install in unit test

JIRA: FUNCTEST-638

Pip is a better alternative to Easy Install for installing Python packages.
There is no need to install easy_install.

Change-Id: I3dee17a800d11907c7f0942bff251a93675978bb
Signed-off-by: helenyao <3eb787ab97713f28a85d5a5517e91512dad61756@huawei.com>

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