LU-17431 utils: add 'dynamic' parameter to nodemap_cmd

LU-17431 utils: add 'dynamic' parameter to nodemap_cmd

Adding a 'dynamic' parameter to nodemap_cmd() will enable
'lctl nodemap_*' commands to handle dynamic nodemaps, i.e.
nodemaps created directly on MDS/OSS side, and stored in memory.

If both MDT and OST are running on the same node, the MDS device
is used for the ioctl.  It doesn't matter which one is actually
used, since it gets to the same place in ptlrpc anyway, it just
needs to find a valid OBD device to run the ioctl.

Test-Parameters: trivial
Signed-off-by: Sebastien Buisson <sbuisson@ddn.com>
Change-Id: Id58199e1ad6622aad896737604c0a8e1287ba34e
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/54503
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>