Collect ramoops data into BMC dump

- Add ramoops file monitor and support to enable ramoops data
  collection for kernel dump.

- Systemd will collect ramoops data and write it into
  /var/lib/systemd/pstore when a system kernel oops/panics.

- Today, need to grab everything in that directory, put it in a dump
  and then delete everything in that directory.

Tested:
- Simulate a kernel panic by creating similar data in the expected
  location.
  `dmesg > /var/lib/systemd/pstore/dmesg1.txt`
  `dmesg > /var/lib/systemd/pstore/dmesg2.txt`
  `dmesg > /var/lib/systemd/pstore/dmesg3.txt`
  `dmesg > /var/lib/systemd/pstore/dmesg4.txt`

  tar -tvf obmcdump_1_248.tar.xz:

  drwxr-xr-x 0/0         0 1970-01-01 00:01:32 obmcdump_1_248/
  -rw-r--r-- 0/0     21239 1970-01-01 00:01:32 obmcdump_1_248/dmesg1.txt
  -rw-r--r-- 0/0     21239 1970-01-01 00:01:32 obmcdump_1_248/dmesg2.txt
  -rw-r--r-- 0/0     21239 1970-01-01 00:01:32 obmcdump_1_248/dmesg3.txt
  -rw-r--r-- 0/0     21239 1970-01-01 00:01:32 obmcdump_1_248/dmesg4.txt
  -rw-r--r-- 0/0       162 1970-01-01 00:01:32 obmcdump_1_248/dreport.log
  -rw-r--r-- 0/0       294 1970-01-01 00:01:31 obmcdump_1_248/os-release
  -rw-r--r-- 0/0       278 1970-01-01 00:01:31 obmcdump_1_248/summary.log

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: I05bca408f4dcc2b62350104a0c5f757d740dde22
diff --git a/meson_options.txt b/meson_options.txt
index de4a7ee..93c8fc4 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -63,6 +63,11 @@
         description : 'Directory where bmc dumps are placed'
       )
 
+option('SYSTEMD_PSTORE_PATH', type : 'string',
+        value : '/var/lib/systemd/pstore/',
+        description : 'Path to the systemd pstore directory'
+)
+
 option('BMC_DUMP_MAX_SIZE', type : 'integer',
         value : 200,
         description : 'Maximum size of one bmc dump in kilo bytes'