Copy properties instead of setting as default value

Updated ebean-test-containers to 7.8

…ltiple places

When a config is loaded with loadSettings from different places, the
behaviour of customProperties/clientInfo/initSql is not consistent

setDefaults did not honor clientInfo / initSql at all.

multiple loadSettings should merge customProps/clientInfo/initSql
Old behaviour:
- initSql is always overwritten
- customProps are overwritten, if value is present in config
  (even if it was empty)
- clientInfo is only overwrtitten when configured in properties

New behaviour:
- all of them are merged. So multiple loadSettings will append initSql
  or put all props to clientInfo/customProps

btw: initSql also supports "delimiter $$"

when copy-pasting (and replacing xxx) it did not work...
took some time, until I see, that it is all lowercase

…cros

Add totalAcquireMicros() and totalWaitMicros() to PoolStatus

fixed spelling of captureStackTrace

Merge customProperties/clientInfo/initSql when loading config from multiple places