[hapi] Rename constant name.

The case for "Hatohol Arm Plugin Process", I use the "HAP".
[HatoholArmPluginGate] Modified to follow the coding roule (numXXX).
[hapi] Rename function name.

checkPluginConnection -> monitorArmPluginTimeout
endCheckPluginConnection -> endMonitorArmPluginTimeout
detectArmPluginConnectTimeout -> detectedArmPluginTimeout