fix(etcd): Fix forced config reset

When a server name or a data directory were not provided, the
reset functionality would fail to clear out config files from
the appropriate place. This calcualtes the default server name
and data directory before reset is called.

server/config_test.go

@@ -313,6 +313,24 @@ func TestConfigNameFlag(t *testing.T) {
 	assert.Equal(t, c.Name, "test-name", "")
 }
 
+// Ensures that a Name gets guessed if not specified
+func TestConfigNameGuess(t *testing.T) {
+	c := NewConfig()
+	assert.Nil(t, c.LoadFlags([]string{}), "")
+	assert.Nil(t, c.Sanitize())
+	name, _ := os.Hostname()
+	assert.Equal(t, c.Name, name, "")
+}
+
+// Ensures that a DataDir gets guessed if not specified
+func TestConfigDataDirGuess(t *testing.T) {
+	c := NewConfig()
+	assert.Nil(t, c.LoadFlags([]string{}), "")
+	assert.Nil(t, c.Sanitize())
+	name, _ := os.Hostname()
+	assert.Equal(t, c.DataDir, name+".etcd", "")
+}
+
 // Ensures that Snapshot can be parsed from the environment.
 func TestConfigSnapshotEnv(t *testing.T) {
 	withEnv("ETCD_SNAPSHOT", "1", func(c *Config) {