OVS: update INSTALL.KVM

    When i played with OVS again today, i found that the argument
of "ovs-dpctl show" is not correct, so INSTALL.KVM need to be
updated accordingly.

Signed-off-by: Zhi Yong Wu <wuzhy@linux.vnet.ibm.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>
ovs-vswitchd: Fix typo in manpage.

Reported-by: Justin Pettit <jpettit@nicira.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>