Devsds installation script fails with mount point busy in ubuntu 18.O4

[Shruthi-1MN]

Issue/Feature Description:
Devsds installation script fails with mount point busy in ubuntu 18.O4

Why this issue to fixed / feature is needed(give scenarios or use cases):
Devsds installation script fails with mount point busy in ubuntu 18.O4
Displays following error message

2020-08-06 09:17:32.573 | + local vg=opensds-volumes-default
2020-08-06 09:17:32.573 | + sudo lvremove -f opensds-volumes-default
2020-08-06 09:17:32.642 | + osds::lvm::set_configuration
2020-08-06 09:17:32.642 | + cat
2020-08-06 09:17:32.642 | + cat
2020-08-06 09:17:32.643 | + osds::lvm::set_configuration_for_file
2020-08-06 09:17:32.643 | + cat
2020-08-06 09:17:32.644 | + cat
2020-08-06 09:17:32.644 | + local nvmevg=opensds-volumes-nvme
2020-08-06 09:17:32.644 | + [[ -e /dev/nvme0n1 ]]
2020-08-06 09:17:32.644 | + osds::lvm::create_nvme_vg opensds-volumes-nvme 20G
2020-08-06 09:17:32.644 | + local vg=opensds-volumes-nvme
2020-08-06 09:17:32.644 | + local size=20G
2020-08-06 09:17:32.645 | ++ parted /dev/nvme0n1 unit GB print free
2020-08-06 09:17:32.645 | ++ grep 'Free Space'
2020-08-06 09:17:32.645 | ++ tail -n1
2020-08-06 09:17:32.645 | ++ awk '{print $3}'
2020-08-06 09:17:32.660 | + cap=0.00GB
2020-08-06 09:17:32.660 | + '[' cap ']'
2020-08-06 09:17:32.660 | + sudo mkdir -p /opt/opensdsNvme/opensds-volumes-nvme
2020-08-06 09:17:32.669 | + sudo mount /dev/nvme0n1 /opt/opensdsNvme/opensds-volumes-nvme
2020-08-06 09:17:32.674 | mount: /opt/opensdsNvme/opensds-volumes-nvme: /dev/nvme0n1 already mounted or mount point busy.

How to reproduce, in case of a bug:

Other Notes / Environment Information: (Please give the env information, log link or any useful information for this issue)