[BACKPORT][v1.6.1][IMPROVEMENT] Improve environment_check script for NFS protocol bug and the host system self diagnosis

[github-actions]

backport #7931

This is just tracking the change to environment_check.sh, not the added Node Condition from that issue.

[james-munson]

Marking as ready for test.

[roger-ryao]

Hi @james-munson:
After running environment_check.sh, I noticed two things that need improvement:

1. The link https://longhorn.io/kb/troubleshooting-rwx-volume-fails-to-attached-caused-by-protocol-not-supported.md should be updated to https://longhorn.io/kb/troubleshooting-rwx-volume-fails-to-attached-caused-by-protocol-not-supported/.
2. According to https://longhorn.io/kb/troubleshooting-rwx-volume-fails-to-attached-caused-by-protocol-not-supported/, the Ubuntu kernel version 6.5.0-21 is also known to have the issue, but this information is not reflected in the environment_check.sh output.

[INFO]  MountPropagation is enabled
[INFO]  Checking kernel release...
[WARN]  Node w2-standard-pc-q35-ich9-2009 has a kernel version 5.15.0-97-generic known to have a breakage that affects Longhorn.  See description and solution at https://longhorn.io/kb/troubleshooting-rwx-volume-fails-to-attached-caused-by-protocol-not-supported.md
[INFO]  Checking iscsid...

[james-munson]

After discussion, we decided to leave the check range as it is, and not try to maintain an exhaustive list of kernels to warn about in this script.
The invalid reference to the KB page has already been fixed and backported in a separate PR.

[roger-ryao]

Verified on v1.6.x-head 20240311

• longhorn v1.6.x-head 7e01ba1

Result Passed

The link https://longhorn.io/kb/troubleshooting-rwx-volume-fails-to-attached-caused-by-protocol-not-supported.md has be updated to https://longhorn.io/kb/troubleshooting-rwx-volume-fails-to-attached-caused-by-protocol-not-supported/.

> curl -sSfL https://raw.githubusercontent.com/longhorn/longhorn/v1.6.x/scripts/environment_check.sh | bash
[INFO]  Required dependencies 'kubectl jq mktemp sort printf' are installed.
[INFO]  All nodes have unique hostnames.
[INFO]  Waiting for longhorn-environment-check pods to become ready (0/3)...
[INFO]  All longhorn-environment-check pods are ready (3/3).
[INFO]  MountPropagation is enabled
[INFO]  Checking kernel release...
[WARN]  Node w2-standard-pc-q35-ich9-2009 has a kernel version 5.15.0-97-generic known to have a breakage that affects Longhorn.  See description and solution at https://longhorn.io/kb/troubleshooting-rwx-volume-fails-to-attached-caused-by-protocol-not-supported
[INFO]  Checking iscsid...
[ERROR] Neither iscsid.service nor iscsid.socket is running on w1-standard-pc-q35-ich9-2009
[ERROR] Neither iscsid.service nor iscsid.socket is running on c1-standard-pc-q35-ich9-2009
[ERROR] Neither iscsid.service nor iscsid.socket is running on w2-standard-pc-q35-ich9-2009
[INFO]  Checking multipathd...
[INFO]  Checking packages...
[ERROR] nfs-common is not found in w1-standard-pc-q35-ich9-2009.
[ERROR] nfs-common is not found in c1-standard-pc-q35-ich9-2009.
[ERROR] nfs-common is not found in w2-standard-pc-q35-ich9-2009.