[INTERNAL] Component.isKeepAliveSupported must return a boolean value
[INTERNAL] Component.isKeepAliveSupported must return a boolean value

If no keep alive config is given the function must not return undefined,
but false instead.

Change-Id: I3cd75c84628c449f6c87ff2c3bfa1b0d28d27677

SAP/openui5,SAP/openui5,SAP/openui5,SAP/openui5