TEZ-1886. remove deprecation warnings for tez-ui on the console. (Prakash Ramachandran via hitesh)

(cherry picked from commit 174b11bb067231a27744ba05f791b61e90364103)
TEZ-1878. Task-specific log level override not working in certain
conditions. (sseth)
(cherry picked from commit a139989c0b43074514bf936511be4e5111a30344)
Moved TEZ-1775 and TEZ-1878 into the 0.5.4 release section.
TEZ-1762. Lots of unit tests do not have timeout parameter set (zjffdu)

(cherry picked from commit 45a443166d2a1ffdfc6e5d14b386fd20f4e72365)