Add functions to get SSL Certificates files

[jeffprestes]

Add functions below to main.go

func getFullchainPemFilePath() string {
	fullchain := config.Cfg.Section("").Key("fullchain_path").String()
	return fullchain
}

func getPrivatekeyPemFilePath() string {
	privatekey := config.Cfg.Section("").Key("privatekey_path").String()
	return privatekey
}