Fix mounting on QEMU with socket_vmnet

[spowelljr]

Closes #15107

Before:

$ minikube mount ./thing:/mount123
📁  Mounting host path ./thing into VM as /mount123 ...
    ▪ Mount type:   
    ▪ User ID:      docker
    ▪ Group ID:     docker
    ▪ Version:      9p2000.L
    ▪ Message Size: 262144
    ▪ Options:      map[]
    ▪ Bind Address: 192.168.105.6:58140
🚀  Userspace file server: ufs starting
🛑  Userspace file server is shutdown

❌  Exiting due to GUEST_MOUNT: mount with cmd /bin/bash -c "sudo mount -t 9p -o dfltgid=$(grep ^docker: /etc/group | cut -d: -f3),dfltuid=$(id -u docker),msize=262144,port=58140,trans=tcp,version=9p2000.L 192.168.105.6 /mount123" : /bin/bash -c "sudo mount -t 9p -o dfltgid=$(grep ^docker: /etc/group | cut -d: -f3),dfltuid=$(id -u docker),msize=262144,port=58140,trans=tcp,version=9p2000.L 192.168.105.6 /mount123": Process exited with status 32
stdout:

stderr:
mount: /mount123: mount(2) system call failed: Connection refused.


╭────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╮
│                                                                                                                        │
│    😿  If the above advice does not help, please let us know:                                                          │
│    👉  https://github.com/kubernetes/minikube/issues/new/choose                                                        │
│                                                                                                                        │
│    Please run `minikube logs --file=logs.txt` and attach logs.txt to the GitHub issue.                                 │
│    Please also attach the following file to the GitHub issue:                                                          │
│    - /var/folders/9l/6wpxv6wd1b901m1146r579wc00rqw3/T/minikube_mount_6b51cf7e154ef7ec9dd71a511f021b37ee49a5f9_0.log    │
│                                                                                                                        │
╰────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯

After:

$ minikube mount ./thing:/mount123
📁  Mounting host path ./thing into VM as /mount123 ...
    ▪ Mount type:   
    ▪ User ID:      docker
    ▪ Group ID:     docker
    ▪ Version:      9p2000.L
    ▪ Message Size: 262144
    ▪ Options:      map[]
    ▪ Bind Address: 192.168.105.1:59680
🚀  Userspace file server: ufs starting
✅  Successfully mounted ./thing to /mount123

📌  NOTE: This process must stay alive for the mount to be accessible ...

Trying to mount on user network:

$ minikube mount ./thing:/mount123

❌  Exiting due to MK_UNIMPLEMENTED: minikube mount is not currently implemented with the user network on QEMU, try starting minikube with '--network=socket_vmnet'

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: medyagh, spowelljr

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