Update parameter variables
Update parameter variables

Because opcodes are generated, parameter variables no longer
exist. This patch fixes the Python opcode tests not to refer to these
variables.

Signed-off-by: Jose A. Lopes <0fb9c4f8511df4ec2ae28af879e9d462f6218a2c@google.com>
Reviewed-by: Guido Trotter <f62ca4d5358bdaeef0e50e57f9f7e231de63727e@google.com>

mbakke/ganeti,onponomarev/ganeti,dimara/ganeti,yiannist/ganeti,grnet/snf-ganeti,dimara/ganeti,andir/ganeti,bitemyapp/ganeti,bitemyapp/ganeti,ganeti/ganeti,grnet/snf-ganeti,leshchevds/ganeti,mbakke/ganeti,apyrgio/snf-ganeti,onponomarev/ganeti,apyrgio/ganeti,leshchevds/ganeti,andir/ganeti,ganeti/ganeti,leshchevds/ganeti,yiannist/ganeti,ganeti-github-testing/ganeti-test-1,apyrgio/snf-ganeti,apyrgio/ganeti,ganeti/ganeti,andir/ganeti,yiannist/ganeti,mbakke/ganeti,ganeti-github-testing/ganeti-test-1