avoid "'sh' is not recognized..." error in mtr on windows

plugin/hashicorp_key_management/mysql-test/vault/suite.pm

@@ -4,13 +4,13 @@ package My::Suite::Vault;
 
 use strict;
 
-return "Hashicorp Vault key management utility not found"
-  unless `sh -c "command -v vault"`;
-
 return "You need to set the value of the VAULT_ADDR variable"
   unless $ENV{VAULT_ADDR};
 
 return "You need to set the value of the VAULT_TOKEN variable"
   unless $ENV{VAULT_TOKEN};
 
+return "Hashicorp Vault key management utility not found"
+  unless `sh -c "command -v vault"`;
+
 bless {};