tests/int: update info about EL9 kernel

The issue quoted is now fixed, so add some information about the fixed
kernel version, and remove links to older discussions about idmapped
mounts security.

We can actually remove all of it for now, but let's keep it. Change
the skip message to say which kernel is required.

Amends commit b460dc3.

Signed-off-by: Kir Kolyshkin <[email protected]>

Author: kolyshkin

tests/integration/helpers.bash

@@ -771,25 +771,15 @@ function requires_idmap_fs() {
 		;;
 	*operation\ not\ permitted)
 		if uname -r | grep -q el9; then
-			# centos kernel 5.14.0-200 does not permit using ID map mounts due to a
-			# specific patch added to their sources:
+			# Older EL9 kernels did not permit using ID map mounts
+			# due to a specific patch added to their sources:
 			# 	https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/merge_requests/131
 			#
-			# There doesn't seem to be any technical reason behind
-			# it, none was provided in numerous examples, like:
-			# 	https://lore.kernel.org/lkml/[email protected]/T/#m3a9df31aa183e8797c70bc193040adfd601399ad
-			#	https://lore.kernel.org/lkml/[email protected]/T/#m59cdad9630d5a279aeecd0c1f117115144bc15eb
-			#	https://lore.kernel.org/lkml/[email protected]
-			#	https://lore.kernel.org/lkml/20210510125147.tkgeurcindldiwxg@wittgenstein
+			# That patch was reverted in:
+			# 	https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/merge_requests/2179
 			#
-			# So, sadly we just need to skip this on centos.
-			#
-			# TODO Nonetheless, there are ongoing works to revert the patch
-			# deactivating ID map mounts:
-			# https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/merge_requests/2179/diffs?commit_id=06f4fe946394cb94d2cf274aa7f3091d8f8469dc
-			# Once this patch is merge, we should be able to remove the below skip
-			# if the revert is backported or if CI centos kernel is upgraded.
-			skip "sadly, centos kernel 5.14 does not permit using ID map mounts"
+			# The above revert is included into the kernel 5.14.0-334.el9.
+			skip "Needs kernel >= 5.14.0-334.el9"
 		fi
 		;;
 	esac