Update srs_app_hls.cpp
Update srs_app_hls.cpp

for hls, srs should not allow player to cache m3u8 list.

add #EXT-X-ALLOW-CACHE:NO to m3u8 file.
lzpfmh/simple-rtmp-server,WilliamRen/srs,nestle1998/srs,avplus/srs,myself659/simple-rtmp-server,newlightdd/srs,JinruiWang/srs,JinruiWang/srs,KevinHM/simple-rtmp-server,ossrs/srs,avplus/srs,newlightdd/srs,wenqinruan/srs,keyanmca/srs-May-2014,CallMeNP/srs,tribbiani/srs,icevl/srs,WilliamRen/srs,winlinvip/srs,ossrs/srs,zhiliaoniu/simple-rtmp-server,myself659/simple-rtmp-server,ossrs/srs,chengjunjian/simple-rtmp-server,skyfe79/srs,oceanho/simple-rtmp-server,dymx101/simple-rtmp-server,winlinvip/srs,WilliamRen/srs,zhiliaoniu/simple-rtmp-server,tempbottle/simple-rtmp-server,Robinson10240/simple-rtmp-server,Vincent0209/simple-rtmp-server,ossrs/srs,keyanmca/srs-May-2014,nestle1998/srs,dymx101/srs,zhiliaoniu/simple-rtmp-server,antonioparisi/srs,drunknbass/srs,flashbuckets/srs,KevinHM/simple-rtmp-server,danielfree/srs,JinruiWang/srs,JinruiWang/srs,wenqinruan/srs,winlinvip/srs,keyanmca/srs-May-2014,ossrs/srs,CallMeNP/srs,Robinson10240/simple-rtmp-server,rudeb0t/simple-rtmp-server,winlinvip/simple-rtmp-server,Robinson10240/simple-rtmp-server,skyfe79/srs,dymx101/srs,newlightdd/srs,KevinHM/simple-rtmp-server,Vincent0209/simple-rtmp-server,wenqinruan/srs,keyanmca/srs-May-2014,WilliamRen/srs,icevl/srs,dymx101/srs,tempbottle/simple-rtmp-server,rudeb0t/simple-rtmp-server,keyanmca/srs-May-2014,danielfree/srs,flashbuckets/srs,flashbuckets/srs,drunknbass/srs,danielfree/srs,chengjunjian/simple-rtmp-server,nestle1998/srs,danielfree/srs,antonioparisi/srs,nestle1998/srs,avplus/srs,lzpfmh/simple-rtmp-server,tempbottle/simple-rtmp-server,WilliamRen/srs,tribbiani/srs,tempbottle/simple-rtmp-server,drunknbass/srs,oceanho/simple-rtmp-server,Vincent0209/simple-rtmp-server,KevinHM/simple-rtmp-server,lewdon/srs,Robinson10240/simple-rtmp-server,lewdon/srs,skyfe79/srs,drunknbass/srs,avplus/srs,antonioparisi/srs,dymx101/srs,drunknbass/srs,skyfe79/srs,icevl/srs,Robinson10240/simple-rtmp-server,tribbiani/srs,lewdon/srs,chengjunjian/simple-rtmp-server,dymx101/simple-rtmp-server,danielfree/srs,keyanmca/srs-May-2014,skyfe79/srs,flashbuckets/srs,oceanho/simple-rtmp-server,tribbiani/srs,antonioparisi/srs,oceanho/simple-rtmp-server,skyfe79/srs,lewdon/srs,tempbottle/simple-rtmp-server,rudeb0t/simple-rtmp-server,winlinvip/srs,rudeb0t/simple-rtmp-server,newlightdd/srs,wenqinruan/srs,JinruiWang/srs,lzpfmh/simple-rtmp-server,ossrs/srs,KevinHM/simple-rtmp-server,nestle1998/srs,Robinson10240/simple-rtmp-server,dymx101/simple-rtmp-server,dymx101/simple-rtmp-server,lewdon/srs,lzpfmh/simple-rtmp-server,tribbiani/srs,newlightdd/srs,flashbuckets/srs,icevl/srs,oceanho/simple-rtmp-server,dymx101/srs,tribbiani/srs,icevl/srs,avplus/srs,oceanho/simple-rtmp-server,lewdon/srs,dymx101/simple-rtmp-server,CallMeNP/srs,WilliamRen/srs,tempbottle/simple-rtmp-server,zhiliaoniu/simple-rtmp-server,nestle1998/srs,winlinvip/srs,avplus/srs,drunknbass/srs,KevinHM/simple-rtmp-server,antonioparisi/srs,CallMeNP/srs,antonioparisi/srs,chengjunjian/simple-rtmp-server,CallMeNP/srs,myself659/simple-rtmp-server,winlinvip/srs,zhiliaoniu/simple-rtmp-server,myself659/simple-rtmp-server,wenqinruan/srs,avplus/srs,chengjunjian/simple-rtmp-server,myself659/simple-rtmp-server,Vincent0209/simple-rtmp-server,rudeb0t/simple-rtmp-server,JinruiWang/srs,newlightdd/srs,CallMeNP/srs,lzpfmh/simple-rtmp-server,myself659/simple-rtmp-server,Vincent0209/simple-rtmp-server,Vincent0209/simple-rtmp-server,lzpfmh/simple-rtmp-server,tribbiani/srs,rudeb0t/simple-rtmp-server,icevl/srs,flashbuckets/srs,chengjunjian/simple-rtmp-server,dymx101/srs,wenqinruan/srs,dymx101/simple-rtmp-server,danielfree/srs,zhiliaoniu/simple-rtmp-server