Add 'rvm use system;' to Dockerfile for vIMS
Add 'rvm use system;' to Dockerfile for vIMS

JIRA: FUNCTEST-120

Also changed the order of the image command

Change-Id: Iecd4025929b93f64356a79cf45df1d1eca257a36
Signed-off-by: jose.lausuch <a4ed9890ad7f6494ac84a749f29a4dc3449a1186@ericsson.com>

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