CP-8868: Development for WLB Audit Report - XenCenter Part

Enhance WLB pool audit trail report:
1). Update advance settings to control audit trail granularity.
2). Update pool audit trail report to add user and object lists for selection.
3). Display large pool audit trail report with sections.
4). Localization for Chinese version.
5). Compatibility with WLB 6.5 and 6.1 or before.

Signed-off-by: Hui Zhang <hui.zhang@citrix.com>
CP-8868: Development for WLB Audit Report - XenCenter Part.

Update code to address the review comments.

Signed-off-by: Hui Zhang <hui.zhang@citrix.com>
Merge pull request #144 from xs-nanjing/CP-8868

CP-8868: Development of WLB Pool Audit Trail Report Enhancement - XenCenter Part