handle 'create_and_mount_brick' better in glusterfsd.py

[amarts]

@sputnik13

so, I updated to 0.7.6 from 0.7.1, and I’m seeing this error in the gluster server…. [2021-01-19 22:29:14,221] ERROR [glusterfsd - 104:create_and_mount_brick] - Failed to create file system fstype=xfs device=/dev/sda
it shouldn’t be creating a filesystem, it’s an existing volume
unsure what’s going on

I think it reinitialized my storage
seems like all data I had is gone

@amarts

caused by the baseimage change from fedora to ubuntu...

@aravindavk

it will not reformat if filesystem exists(No force option used), so no data loss. Need to figure out how to get back up