lint add deadcode unused (#4606)

Added deadcode and unused linters to the repo, it
helped find some unused code.

Ref #4589

client/keys/errors.go

@@ -1,31 +0,0 @@
-package keys
-
-import "fmt"
-
-func errKeyNameConflict(name string) error {
-	return fmt.Errorf("account with name %s already exists", name)
-}
-
-func errMissingName() error {
-	return fmt.Errorf("you have to specify a name for the locally stored account")
-}
-
-func errMissingPassword() error {
-	return fmt.Errorf("you have to specify a password for the locally stored account")
-}
-
-func errMissingMnemonic() error {
-	return fmt.Errorf("you have to specify a mnemonic for key recovery")
-}
-
-func errInvalidMnemonic() error {
-	return fmt.Errorf("the mnemonic is invalid")
-}
-
-func errInvalidAccountNumber() error {
-	return fmt.Errorf("the account number is invalid")
-}
-
-func errInvalidIndexNumber() error {
-	return fmt.Errorf("the index number is invalid")
-}

client/lcd/root.go

@@ -30,9 +30,8 @@ type RestServer struct {
 	CliCtx  context.CLIContext
 	KeyBase keybase.Keybase
 
-	log         log.Logger
-	listener    net.Listener
-	fingerprint string
+	log      log.Logger
+	listener net.Listener
 }
 
 // NewRestServer creates a new rest server instance