Remove the constraint of INSTALLER_TYPE
Remove the constraint of INSTALLER_TYPE

Revert the patch: https://gerrit.opnfv.org/gerrit/#/c/45167
When run on non-opnfv deployment, there is no such concept of INSTALLER_TYPE.

Change-Id: I3d420334c9329f7565cf22a0c314a4ffdb410d36
Signed-off-by: Linda Wang <81613bebe84fa394bbc7c5cc1c21989c9bff2c52@huawei.com>

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