LU-18769 lnet: lnetctl memory corruption because of buffer overflow

LU-18769 lnet: lnetctl memory corruption because of buffer overflow

Sometimes the the user passed name is larger than the size of
lnet_dlc_intf_descr.intf_name. Add proper validation checks before
strncpy and strcpy so that the buffer does not overflow.

Test-Parameters: trivial
Signed-off-by: Manish Regmi <mregmi@ddn.com>
Change-Id: Ifa867cd60ded64fcefe0a6b948f34e9f542e6e04
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/58288
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Chris Horn <chris.horn@hpe.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>