fstests: btrfs/195: skip raid setups not in the profile configs

fstests: btrfs/195: skip raid setups not in the profile configs

You can specify a custom BTRFS_PROFILE_CONFIGS to skip certain raid
configurations in the tests, however btrfs/195 doesn't honor this
currently.  Fix this up by getting the profile configs and skipping any
configurations that are not listed in BTRFS_PROFILE_CONFIGS.

Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Anand Jain <anand.jain@oracle.com>