Occasionally http daemon encounters a panic during initialisation routine

[HouzuoGuo]

As noticed and recovered by supervisor:

panic: http: multiple registrations for /
goroutine 384 [running]:
net/http.(*ServeMux).Handle(0xc4203a94d0, 0xc4200136a8, 0x1, 0x9bd820, 0xc4202b5460)
/home/howard/go/src/net/http/server.go:2270 +0x627
net/http.(*ServeMux).HandleFunc(0xc4203a94d0, 0xc4200136a8, 0x1, 0xc4202b5460)
/home/howard/go/src/net/http/server.go:2302 +0x55
github.com/HouzuoGuo/laitos/daemon/httpd.(*Daemon).Initialise(0xc4201326e0, 0xc42047a6f0, 0xc4203263c0)
/home/howard/gopath/src/github.com/HouzuoGuo/laitos/daemon/httpd/httpd.go:175 +0x409
github.com/HouzuoGuo/laitos/launcher.Config.GetHTTPD.func1()
/home/howard/gopath/src/github.com/HouzuoGuo/laitos/launcher/config.go:308 +0x512
sync.(*Once).Do(0xc420419ab0, 0xc4201e2690)
/home/howard/go/src/sync/once.go:44 +0xbe
github.com/HouzuoGuo/laitos/launcher.Config.GetHTTPD(0xc420000f00, 0xc420013840, 0xb, 0xc42005f400, 0x11, 0x9dd, 0xc420013830, 0x6, 0xc42008c140, 0x45, ...)
/home/howard/gopath/src/github.com/HouzuoGuo/laitos/launcher/config.go:206 +0x89
main.main.func2(0xc4203e9140, 0xc420081b00)
/home/howard/gopath/src/github.com/HouzuoGuo/laitos/main.go:264 +0x57
created by main.main

[HouzuoGuo]

This issue hasn't been observed again after many restart attempts.