LU-11820 tests: skip conf-sanity test_106 for SLOW=no

LU-11820 tests: skip conf-sanity test_106 for SLOW=no

This test currently takes 40 minutes to run, so it should be
skipped for SLOW=no test runs.

Test-Parameters: trivial testlist=conf-sanity
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: I120747e21d046bd28667e2ff26013ae51f9cab07
Reviewed-on: https://review.whamcloud.com/33902
Tested-by: Jenkins
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Artem Blagodarenko <c17828@cray.com>
Reviewed-by: James Nunez <jnunez@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>