vinum_read: Don't lock configuration from userland.  If vinum(8)             crashes, the config remains locked and causes all             subsequent start or read attempts to fail.  This is part             of a fix for the recently reported hangs.
vinum_read: Don't lock configuration from userland.  If vinum(8)
            crashes, the config remains locked and causes all
            subsequent start or read attempts to fail.  This is part
            of a fix for the recently reported hangs.

Approved by:  re (scottl)

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase