GRAILS-10781 - remove extraneous quotes around enum values in HAL JSON renderer
organize import statements
Fix test that is failing on the CI server

We need to fix this test so it isn't TZ dependent.  The previous revision passes for me here in US central.  This change should allow it to pass on the build server.  I will follow up with a better solution.
GRAILS-10410: Make it possible to pass model to layout template in g:applyLayout
improve timezone handling in test
replace some tabs with spaces

The tabs were a mistake.  I recently reinstalled my IDE and forgot to setup the whitespace handling.
Merge branch '2.3.x' of github.com:grails/grails-core into 2.3.x
Merge branch '2.3.x'