Update gopsutil

[danielnelson]

closes #6103

Required for all PRs:

• Signed CLA.
• Associated README.md updated.
• Has appropriate unit tests.

[adrianlzt]

This PR updates Gopkg.lock but does not update Gopkg.toml.
Is that an error?

Currently in master:

Gopkg.toml

[[constraint]]
  name = "github.com/shirou/gopsutil"
  version = "2.18.12"

Gopkg.lock

[[projects]]
  digest = "1:55dcddb2ba6ab25098ee6b96f176f39305f1fde7ea3d138e7e10bb64a5bf45be"
  name = "github.com/shirou/gopsutil"
  packages = [
    "cpu",
    "disk",
    "host",
    "internal/common",
    "load",
    "mem",
    "net",
    "process",
  ]
  pruneopts = ""
  revision = "e4ec7b275ada47ca32799106c2dba142d96aaf93"
  version = "v2.19.8"

[adrianlzt]

An important change also coming with this update is a change in disk device names in this commit.

Previously:

> disk,device=mapper/vg00-lvusr,path=/usr ...

After the new gopsutil version:

> disk,device=dm-2,path=/usr

[danielnelson]

This PR updates Gopkg.lock but does not update Gopkg.toml.
Is that an error?

In this case yes, we need to update the toml to the version of gopsutil that has the SUnreclaim field. I'm fixing this in #6716.

An important change also coming with this update is a change in disk device names in this commit.

Thanks for the heads up, I'm still looking into this but we may want to use func (s *DiskIO) diskName(devName string) like code to deal with this.

[danielnelson]

I think since the disk device name change was included in 1.12.0 and we are getting ready to release 1.13, it will be best at this point to not attempt to work around the change anymore.