fixed opMemcacheSessionStorage, because it calls session_start() two or more times (fixes #1403, BP from #1324)
fixed opMemcacheSessionStorage, because it calls session_start() two or more times (fixes #1403, BP from #1324)

upsilon/OpenPNE3,tejima/testravis,balibali/KakiageSNS,tejima/testravis,balibali/KakiageSNS,upsilon/OpenPNE3,tejima/testravis