Maint: Change "inactive" to "stopped" in reinventory action's description

"Inactive" is ambiguous, and could describe a stopped master, a master which
is running but happens to be idle, a master which has no agents attempting to
reach it, a master which has been removed from the load balancer, or any number
of other things. Instead, we should use the unambiguous term "stopped."
Merge pull request #2104 from nfagerlund/docs_inactive_stopped

Maint: Change "inactive" to "stopped" in reinventory action's descriptio...