Merge PR #27235 into master

* refs/pull/27235/head:
	cephfs-shell: support non-octal mode
	cephfs-shell: fix rm command
	cephfs-shell: fix lls command
	cephfs-shell: fix lcd command
	cephfs-shell: fix umask command
	cephfs-shell: fix cat command
	cephfs-shell: fix chmod command
	cephfs-shell: fix chdir command
	cephfs-shell: fix mv command
	cephfs-shell: fix rmdir command
	cephfs-shell: fix ls command
	cephfs-shell: fix get command
	cephfs-shell: fix put command
	cephfs-shell: fix mkdir command
	cephfs-shell: helper functions and infra changes

Reviewed-by: Patrick Donnelly <pdonnell@redhat.com>