HDFS-11391 Numeric usernames do no work with WebHDFS FS #186
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In HDFS-4983, a property has been introduced to configure the pattern
validating name of users interacting with WebHDFS because default
pattern was excluding names starting with numbers.
Problem is that this fix works only for read access. In case of write
access against data node, the default pattern is still applied whatever
the configuration is.
This PR fixes the web handler running in data nodes.