Oct 15 (Reuters) - Saudi Arabia"s King Salman bin Abdulaziz has relieved Health Minister Tawfiq al-Rabiah from his post and appointed him as new Hajj minister, state media reported on Friday, citing a royal decree. The king also ordered the establishment of a new body that will oversee the development of Yanbu, Umluj, Al-Wajh and Duba regions. The new body will be chaired by the Kingdom"s Crown Prince Mohammed bin Salman, state media said.