CLOUDSTACK-4696 Handle Netscaler Provider enable for both zones

Signed-off-by: venkataswamybabu budumuru <venkataswamybabu.budumuru@citrix.com>
(cherry picked from commit a5ede3af7f5837f9e8a1fb80e2a1f20f24ecb870)
CLOUDSTACK-4634: Fixed issue arising due to wrong indentation
CLOUDSTACK: 4635 - Fixed test case issues due to wrong indentation
CLOUDSTACK: 4640 - Fixed indentation issues in function createInstance