Fix OPSMAN_DISK_TYPE param
Fix OPSMAN_DISK_TYPE param

[#148749371] pivotal-cf/pcf-pipelines #147: Updated the upgrade-ops-manager vsphere pipeline to allow customers to specif…

Signed-off-by: Christian Ang <15ae83feccf4d84083a62aba1cdf46bd8ce2e33b@pivotal.io>

rahulkj/pcf-pipelines,pivotal-cf/pcf-pipelines,BrianMMcClain/pcf-pipelines,pvsone/pcf-pipelines,mcb/pcf-pipelines,mcb/pcf-pipelines,sandyg1/pcf-pipelines,cah-josephgeorge/pcf-pipelines,sandyg1/pcf-pipelines,pivotal-cf/pcf-pipelines,pvsone/pcf-pipelines,pivotal-cf/pcf-pipelines,sandyg1/pcf-pipelines,pivotal-cf/pcf-pipelines,cah-josephgeorge/pcf-pipelines,BrianMMcClain/pcf-pipelines,cah-josephgeorge/pcf-pipelines,mcb/pcf-pipelines,rahulkj/pcf-pipelines,rahulkj/pcf-pipelines,sandyg1/pcf-pipelines,pvsone/pcf-pipelines,rahulkj/pcf-pipelines