LU-14181 tests: except sanity test_64e 64f with SHARED_KEY

LU-14181 tests: except sanity test_64e 64f with SHARED_KEY

Add sanity test_64e and test_64f to ALWAYS_EXCEPT when
SHARED_KEY is used.

Lustre-change: https://review.whamcloud.com/40865
Lustre-commit: aa3bdbc23bc86bae565e78b38946f4ac8fcbeacb

Test-Parameters: trivial
Signed-off-by: Sebastien Buisson <sbuisson@ddn.com>
Change-Id: Iaa9f5038a59f9ddc50dd9ac81ca81effd8bb9b1b
Reviewed-on: https://review.whamcloud.com/40999
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: James Nunez <jnunez@whamcloud.com>