Set narport file based on OS.

From net.juniper.tnc.HttpNAR.HttpNAR

/* 219 */     this.mAppSupportDir = (this.mHomeDir + ((Util.isLinux()) || (Util.isSolaris()) ? "/.juniper_networks/" : Util.isMacOSX() ? "/Library/Application Support/Juniper Networks/" : "/"));