consolidate basic rspec configuration for all sub-projects
consolidate basic rspec configuration for all sub-projects

Turns on const verification for rspec3

Signed-off-by: dmitriy kalinin <0638f5af938d97bf839390c6283ef9e40c331b8e@pivotallabs.com>

loewenstein/bosh-openstack-cpi-release,cloudfoundry-incubator/bosh-openstack-cpi-release,loewenstein/bosh-openstack-cpi-release,voelzmo/bosh-openstack-cpi-release,cloudfoundry-incubator/bosh-openstack-cpi-release,loewenstein/bosh-openstack-cpi-release,cloudfoundry-incubator/bosh-openstack-cpi-release,voelzmo/bosh-openstack-cpi-release,voelzmo/bosh-openstack-cpi-release