Fix nginx agent
Fix nginx agent

When use the nginx agent with OCF_CHECK_LEVEL=20, we can specify the
parameter 'testconffile'. But now the agent file of nginx read
'test20conffile'. So change the name of parameter to 'test20conffile'.

Signed-off-by: KATOH Yasufumi <512423cb3a4857a38f472862b51e4ab1a1730f06@jazz.email.ne.jp>

asp24/resource-agents,asp24/resource-agents,asp24/resource-agents,stevenraspudic/resource-agents,stevenraspudic/resource-agents,stevenraspudic/resource-agents