Support uPortal 5 external configurations

You can override the value of most configuration settings using one or both of the following local configuration files:
calendar.properties
global.properties
Both files are optional. calendar.properties is for calendar-only settings, whereas global.properties is for settings that may also be read and used by uPortal Modules (such as portlets). Both files support all the same settings. If the same setting is defined in both files, the value in feedback.properties "wins."
Both files (if you're using them) must be placed in the portal.home directory. The default location of portal.home is '$
{catalina.base}
/portal', but you can specify your own location by defining a PORTAL_HOME environment variable.