fix(obj-gluster): use OpenDir for directories, avoid segmentation fault #5345
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close #5211 #4043
This problem with libgfapi is caused by this PR gluster/glusterfs#3755.
glfd->entries should be initiated at first like in pub_glfs_opendir.
In pub_glfs_open, it's not initiated and returned without error, which leads to segmentation when calling readdir.