all: please remove uses of log.Fatal* as they don't allow any recoveries nor cleanups and immediately invoke os.Exit

[odeke-em]

Summary of Bug

If we look at this code

sommelier/app/export.go

Lines 59 to 63 in 3157d97

	for _, addr := range jailAllowedAddrs {
	_, err := sdk.ValAddressFromBech32(addr)
	if err != nil {
	log.Fatal(err)
	}

and

sommelier/app/export.go

Line 178 in 3157d97

log.Fatal(err)

we can see the invocation of log.Fatal which will immediately terminate the program having invoked os.Exit, not allowing for any deferred cleanups. Even more, the code all around it uses panic(err)