LPS-36280 Replace complex and expensive check to show the site administration with a check for the VIEW_SITE_ADMINISTRATION permission
LPS-36280 Remove the property "dockbar.show.site.content.icon" because it is no longer needed.

I've doubled checked this with @mhan810
This commit also contains some minor source formatting in ServicePreAction
LPS-36280 The Power User role must provide access to the Site Administration of the personal site by default
LPS-36280 Add code in the verifier to add the permission to existing Power User roles. We check for the MANAGE_LAYOUTS permission and consider that if it has been removed from the role we should not add the permission to go to the site administration.