Though a `swift_operator_role` variable exists to allow specifying an
operator role other than `swiftoperator`, it is not applied to all
uses of the role, eg the proxy-server.conf template.
Replace all remaining hard-coded references to the `swiftoperator`
role with the `swift_operator_role` variable.
Change-Id: Ie6db872cc2b7a1b1a90d9a690ee08937a9cab785
Signed-off-by: Corey Wright <corey.wright@rackspace.com>