Update go-ucfg to 0.7.0

NOTICE.txt

@@ -667,8 +667,8 @@ Apache License 2.0
 
 --------------------------------------------------------------------
 Dependency: github.com/elastic/go-ucfg
-Version: v0.6.5
-Revision: 92d43887f91851c9936621665af7f796f4d03412
+Version: v0.7.0
+Revision: 0539807037ce820e147797f051ff32b05f4f9288
 License type (autodetected): Apache-2.0
 ./vendor/github.com/elastic/go-ucfg/LICENSE:
 --------------------------------------------------------------------

libbeat/common/config.go

@@ -188,6 +188,14 @@ func (c *Config) PathOf(field string) string {
 	return c.access().PathOf(field, ".")
 }
 
+func (c *Config) Remove(name string, idx int) (bool, error) {
+	return c.access().Remove(name, idx, configOpts...)
+}
+
+func (c *Config) Has(name string, idx int) (bool, error) {
+	return c.access().Has(name, idx, configOpts...)
+}
+
 func (c *Config) HasField(name string) bool {
 	return c.access().HasField(name)
 }