[HADOOP-18869] ABFS: Fixing Behavior of a File System APIs on root path - ASF JIRA

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Following HDFS Apis are failing when called on a root path.

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FS Call	Status	Error thrown to caller
create()	Failing	Operation failed: "The request URI is invalid.", 400, PUT, https://anujtesthns.dfs.core.windows.net/abfs-testcontainer-02076119-21ed-4ada-bcd0-14afaae54013/?resource=file&timeout=90, InvalidUri, "The request URI is invalid. RequestId:1d23f8c2-d01f-0059-61b6-c60c24000000 Time:2023-08-04T09:29:55.4813818Z"
createNonRecursive()	Failing	Runtime Exception: java.lang.IllegalArgumentException: null path (This is occuring because getParentPath is null and getFileStatus is called on null)
setXAttr()	Failing	Operation failed: "The request URI is invalid.", 400, HEAD, https://anujtesthns.dfs.core.windows.net/abfs-testcontainer-491399b3-c3d0-4568-9d4a-a26e0aa8f000/?upn=false&timeout=90
getXAttr()	Failing	Operation failed: "The request URI is invalid.", 400, HEAD, https://anujtesthns.dfs.core.windows.net/abfs-testcontainer-491399b3-c3d0-4568-9d4a-a26e0aa8f000/?upn=false&timeout=91

important: xattr support was removed in HADOOP-19089; include that change when cherrypicking this

causes

HADOOP-19089 [ABFS] Reverting Back Support of setXAttr() and getXAttr() on root path

links to

GitHub Pull Request #6003