* Kurdish rebel deputy leader says rebels may restart insurgency in Turkey
* Cemil Bayik demands concessions from Ankara on peace process
* Turkey waging proxy war against Kurds in Syria-Bayik
By Isabel Coles
QANDIL MOUNTAINS, Iraq, Oct 22 (Reuters) - Kurdish rebels are ready to re-enter Turkey from northern Iraq, the head of the group's political wing said at his mountain hideout, ...