update to 2048 bit key for user integration test

As with the previous key added in 19c0916, I deleted the associated
private key using /usr/bin/shred.  But of course, I have no way to prove
that.  Again, all the more reason to always use a test account when
running these integration tests.

tests/integration/users_test.go

@@ -173,8 +173,8 @@ func TestUsers_Keys(t *testing.T) {
 		t.Fatalf("Users.ListKeys('') returned error: %v", err)
 	}
 
-	// ssh public key for testing (fingerprint: 04:11:3a:3d:65:ed:f5:c8:29:90:2d:9c:9f:25:ca:7a)
-	key := "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAAAYQDThS/Tvat+hiKTsZ0fuaSkd/o8cMMufy70BXE2/UPZhUx/M4/XBGGiHGXwEbxcRpSTmEsAyN5vGt7nnZrHsjq/WhZmCjVcNlyfnEMGD0UgfsjwVDTT3Y4BYN62bhW4LfM="
+	// ssh public key for testing (fingerprint: a7:22:ad:8c:36:9f:68:65:eb:ae:a1:e4:59:73:c1:76)
+	key := "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCy/RIqaMFj2wjkOEjx9EAU0ReLAIhodga82/feo5nnT9UUkHLbL9xrIavfdLHx28lD3xYgPfAoSicUMaAeNwuQhmuerr2c2LFGxzrdXP8pVsQ+Ol7y7OdmFPfe0KrzoZaLJs9aSiZ4VKyY4z5Se/k2UgcJTdgQVlLfw/P96aqCx8yUu94BiWqkDqYEvgWKRNHrTiIo1EXeVBCCcfgNZe1suFfNJUJSUU2T3EG2bpwBbSOCjE3FyH8+Lz3K3BOGzm3df8E7Regj9j4YIcD8cWJYO86jLJoGgQ0L5MSOq+ishNaHQXech22Ix03D1lVMjCvDT7S/C94Z1LzhI2lhvyff"
 	for _, k := range keys {
 		if k.Key != nil && *k.Key == key {
 			t.Fatalf("Test key already exists for user.  Please manually remove it first.")