can veneers suitable for chronic periodontitis patients?

You can have veneers placed on any tooth.  The problem is how long will they last?  Why are you doing them?  What other options do you have?  Have a consultation with the dentist to have these questions answered first.  If you gum disease is under control, you can have cosmetics.  If you choose to veneer the front teeth and do not address the gum problems. the teeth may not last and this may make you feel like you threw your money away!  

You should only have cosmetic dentistry if your teeth and gums are healthy enough to support it. If you are already in that stage of gum and bone loss, you may need to have some level of periodontal grafting and certainly need remediation such as deep pocket cleaning and treatment to make sure your gums heal properly. At stage 3, the loss extends to the root, so you also need to make sure that your teeth are healthy before you even think of getting veneers. I would focus on correcting and/or managing your periodontitis before any cosmetic dentistry is done to ensure your mouth is healthy. 

If your periodontal disease is under control and your teeth are stable there is no reason you can't have veneers done on your teeth.  Have a talk with your dentist and discuss your options.  Good luck!