HAL-405 Add Timeout Section to Datasources

Add a new section to the datasource configuration that allows to set
the values from the `<timeout/>` element in the configuration. The
section contains the following attributes:

 * use-try-lock (long)
 * blocking-timeout-millis (long)
 * idle-timeout-minutes (long)
 * set-tx-query-timeout (boolean)
 * query-timeout (long)
 * allocation-retry (int)
 * allocation-retry-wait-millis (long)
 * xa-resource-timeout (int), only for XA

Issue:
https://issues.jboss.org/browse/HAL-405
Merge pull request #14 from marschall/HAL-405

HAL-405 Add Timeout Section to Datasources