Optimized the detect logical of swoole shortname

[huangzhhui]

Optimized the detect logical of swoole shortname.

swoole.use_shortname = true       => string(1) "1"     => enabled
swoole.use_shortname = "true"     => string(1) "1"     => enabled
swoole.use_shortname = on         => string(1) "1"     => enabled
swoole.use_shortname = On         => string(1) "1"     => enabled
swoole.use_shortname = "On"       => string(2) "On"    => enabled
swoole.use_shortname = "on"       => string(2) "on"    => enabled
swoole.use_shortname = 1          => string(1) "1"     => enabled
swoole.use_shortname = "1"        => string(1) "1"     => enabled
swoole.use_shortname = 2          => string(1) "1"     => enabled
swoole.use_shortname = false      => string(0) ""      => disabled
swoole.use_shortname = "false"    => string(5) "false" => disabled
swoole.use_shortname = off        => string(0) ""      => disabled
swoole.use_shortname = Off        => string(0) ""      => disabled
swoole.use_shortname = "off"      => string(3) "off"   => disabled
swoole.use_shortname = "Off"      => string(3) "Off"   => disabled
swoole.use_shortname = 0          => string(1) "0"     => disabled
swoole.use_shortname = "0"        => string(1) "0"     => disabled
swoole.use_shortname = 00         => string(2) "00"    => disabled
swoole.use_shortname = "00"       => string(2) "00"    => disabled
swoole.use_shortname = ""         => string(0) ""      => disabled
swoole.use_shortname = " "        => string(1) " "     => disabled