allow even disperse_data count as an input parameter for creating disperse volumes

[nchilaka]

allow even disperse_data count as an input parameter for creating disperse volumes
currently only disperse_count and redundancy_count are to be entered as input param
however, enduser can even mention data_count, and hence we need to allow that too

[stale]

Thank you for your contributions.
Noticed that this issue is not having any activity in last 3 months! We are marking this issue as stale because it has not had any recent activity and we have decided not to fix it while triaging.
It will be closed in 14 days if no one responds with a comment here.

[stale]

Closing this issue as there was no update since my last update on issue. If this is an issue which is still valid, feel free to reopen it.