openshift.ks: Allow CONF_OPENSHIFT_PASSWORD1

set_defaults: Fix the parameter validation to allow parameters with numbers
in the name so that CONF_OPENSHIFT_USER1 and CONF_OPENSHIFT_PASSWORD1 are
not rejected.

This commit fixes bug 1099067.
Merge pull request #350 from Miciah/enterprise-2.1/openshift.ks-allow-CONF_OPENSHIFT_PASSWORD1

openshift.ks: Allow CONF_OPENSHIFT_PASSWORD1