Use Sys::ProcTable.ps(pid).cmdline instead of our own solution.
Use Sys::ProcTable.ps(pid).cmdline instead of our own solution.

Our MiqProcess#command_line solution was inconsistent on OSX vs. Linux.
Meanwhile, Sys::ProcTable is consistent on both platforms and also supports
Windows.

OSX:
```
require 'miq-process'; MiqProcess.command_line(59670)
=> "ruby             MIQ: MiqGenericWorker id: 31, queue: generic"

require 'sys/proctable'; Sys::ProcTable.ps(59670).cmdline
=> "MIQ: MiqGenericWorker id: 31, queue: generic   "
```

Linux:
```
require 'miq-process'; MiqProcess.command_line(57299)
=> "MIQ: MiqGenericWorker id: 88, queue: generic"

require 'sys/proctable'; Sys::ProcTable.ps(57299).cmdline
=> "MIQ: MiqGenericWorker id: 88, queue: generic"
```

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