close branch ucx-3.1 ucx-3.1

merge branch ucx-3.1

fix incorrect stat flags on linux in metadata test scripts

compatibility with UCX 3.1 plus several minor code fixes ucx-3.1

add more xattr malloc checks

remove disabled realloc debug code from libxattr

improve xattr code

(0) -300 -100 -30 -10 -7 +7 +10 +30 tip

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