Check if fsck has been started for rootfs

In case if fsck has been started it savees 2 files in directory
'/run/initramfs':
- stamp file 'fsck-root' in case if fsck run was successful
- log file 'fsck.log' with filesystem check log

Since fsck is started on every boot it is enough to make sure we have
root file system check on initramfs stage.

Signed-off-by: Denis Pynkin <denis.pynkin@collabora.com>

test-cases/disk-fsck-boot-rootfs.yaml

+metadata:
+  name: disk-rootfs-fsck
+  format: "Apertis Test Definition 1.0"
+  image-types:
+    minimal: [ armhf, arm64, amd64 ]
+    target: [ armhf, arm64, amd64 ]
+  image-deployment:
+    - APT
+    - OSTree
+  type: functional
+  exec-type: automated
+  priority: high
+  maintainer: "Apertis Project"
+  description: "Ensure that the root file system check is enabled on boot"
+
+  expected:
+    - "Test command should report \"pass\"."
+
+install:
+  git-repos:
+    - url: https://gitlab.apertis.org/infrastructure/apertis-tests.git
+      branch: 'apertis/v2019dev0'
+
+run:
+  steps:
+    - "# Enter test directory:"
+    - cd apertis-tests
+    - "# Execute the following command:"
+    - common/run-test-in-systemd --name=as-root common/fsck-boot-rootfs.sh
+
+parse:
+  pattern: "(?P<test_case_id>.*-*):\\s+(?P<result>(pass|fail))"