[kdump]: Collect everything under /sys/kernel/fadump dir

Kernel commit 9dc140785961e ("powerpc/fadump: update documentation about
bootargs_append") added /sys/kernel/fadump/bootargs_append to set up
additional arguments for the fadump kernel.

To debug fadump-related issues, having this new sysfs entry is critical,
so collect it.

Since sos is already collecting most of the files currently present
under /sys/kernel/fadump by listing them individually, let's instead
collect everything inside /sys/kernel/fadump by listing the entire
directory.

This change will not only ensure the collection of
/sys/kernel/fadump/bootargs_append, but will also help capture any new
fadump-related sysfs entries introduced in the future.

Note: the total size of all sysfs files under /sys/kernel/fadump is
      in KBs.

Signed-off-by: Sourabh Jain <sourabhjain@linux.ibm.com>

Author: sourabhjains

sos/report/plugins/kdump.py

@@ -25,11 +25,9 @@ def setup(self):
             "/proc/sys/kernel/panic",
             "/proc/sys/kernel/panic_on_oops",
             "/sys/kernel/kexec_loaded",
+            "/sys/kernel/fadump",
             "/sys/kernel/fadump_enabled",
-            "/sys/kernel/fadump/enabled",
             "/sys/kernel/fadump_registered",
-            "/sys/kernel/fadump/registered",
-            "/sys/kernel/fadump/mem_reserved",
             "/sys/kernel/kexec_crash_size"
         ])