EX-2933 tests: replace the newline with a space in $params

EX-2933 tests: replace the newline with a space in $params

This patch replaces the newline with a space in $params
passing to wait_import_state().

Lustre-change: https://review.whamcloud.com/43159
Lustre-commit: 94332d277e0d79cf0dd345533ba186e73a9e19af

Fixes: ab4a750a51 ("EX-2882 tests: fix hot-pools.sh issues on single node")
Signed-off-by: Jian Yu <yujian@whamcloud.com>
Change-Id: I09c9b72bc4e59cf1ceaf8ae17c36c7f8c567c730
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: John L. Hammond <jhammond@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/43195
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Li Xi <lixi@ddn.com>