replace whitespace with ASCII octal \040

[JenksJ]

When mounting a cifs mount that included white space in the source path the slurm NHC (Node Health Check) fails. This resulted in all the nodes being put into drain:
The slrum warning output was something like:

NHC: check_fs_mount:
/mnt/gen_epi mounted from //10.10.10.10/3.040Projects/sequencing040list
(should match //10.10.10.10/3. Projects/sequencing list)

Ansible mount in /etc/fstab formats white space as ASCII code \040 including the \.
/etc/fstab (and the CIFS kernel client) does not accept pre-escaped \040 in the src path. So the replace(' ', '\\040') was added to ansible/roles/nhc/templates/nhc.conf.j2 as a quick fix.

[sjpb]

@JenksJ is this still really draft or do you want us to review?

[sjpb]

(ignore CI failure, need to do https://github.com/stackhpc/ansible-slurm-appliance/wiki/HOWTOs#run-ci-and-merge-a-pr-from-a-fork)