modify metadata node path in zookeeper

[cvictory]

Modify metadata node path in zookeeper. The path as follow：
/dubbo/metadata/interfaceName/version/group/provider/applicationName or
/dubbo/metadata/interfaceName/version/group/consumer/applicationName

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (2.7.0-release@d4532c6). Click here to learn what that means.
The diff coverage is 0%.

@@               Coverage Diff                @@
##             2.7.0-release    #3166   +/-   ##
================================================
  Coverage                 ?   63.74%           
  Complexity               ?       75           
================================================
  Files                    ?      652           
  Lines                    ?    28317           
  Branches                 ?     4797           
================================================
  Hits                     ?    18051           
  Misses                   ?     7989           
  Partials                 ?     2277

Impacted Files	Coverage Δ	Complexity Δ
.../dubbo/metadata/identifier/MetadataIdentifier.java	60.46% <0%> (ø)	0 <0> (?)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update d4532c6...e3117ef. Read the comment docs.