format code with gofumpt

gofumpt (https://github.com/mvdan/gofumpt) provides a supserset of `gofmt` / `go fmt`,
and addresses various formatting issues that linters may be checking for.

We can consider enabling the `gofumpt` linter to verify the formatting in CI, although
not every developer may have it installed, so for now this runs it once to get formatting
in shape.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

configuration/configuration_test.go

@@ -360,7 +360,6 @@ func (suite *ConfigSuite) TestParseInvalidLoglevel(c *C) {
 
 	_, err = Parse(bytes.NewReader([]byte(configYamlV0_1)))
 	c.Assert(err, NotNil)
-
 }
 
 // TestParseWithDifferentEnvReporting validates that environment variables