Specifies the Ipv4 address to be used as the source for
performing an OAM ping operation when tmnxOamPingCtlTestMode has
a value of 'vprnPing'. This parameter is required.
This object was obsoleted in release 4.0 and replaced with
InetAddress objects tmnxOamVprnPingCtlSrcAddrType and
tmnxOamVprnPingCtlSrcAddress.