vcenter detection plugin throws IndexError
vcenter detection plugin throws IndexError

If nova-compute process is running with the configuration file named
other than 'hypervisor.conf', vcenter detection plugin throws IndexError
exception when it manipulates the parameter of the process.
Fix the plugin to skip the process which doesn't have 'hypervisor.conf'
parameter.

Change-Id: I913bf206d3ae87694f9be7ab03a60d03dcb60d80
Closes-Bug: #1595879

sapcc/monasca-agent,sapcc/monasca-agent,sapcc/monasca-agent