Test ti verify data persistency on vpmem device across reboot

This test verifies that data written to a vpmem.
device persists across system reboots.
Test steps:
1. Check for vpmem device availability
2. Create namespace using ndctl
3. Create file system with DAX support
4. Mount the vpmem device with DAX option
5. Create a test file with unique content
6. Reboot the system
7. Remount the vpmem device
8. Verify the test file still exists with correct content

Signed-off-by: Pavithra <pavrampu@linux.ibm.com>

Author: Pavithra

OpTestConfiguration.py

@@ -463,6 +463,20 @@ def get_parser():
     misc_group.add_argument("--bisect-flag",
                             help="Specify if bisection is to be done or not")
 
+    vpmem_group = parser.add_argument_group("VPMEM", "VPMEM/NVDIMM test configuration")
+    vpmem_group.add_argument("--vpmem-device",
+                            help="Path to vpmem device (default: /dev/pmem0)",
+                            default="/dev/pmem0")
+    vpmem_group.add_argument("--vpmem-mount-point",
+                            help="Mount point for vpmem device (default: /pmem0)",
+                            default="/pmem0")
+    vpmem_group.add_argument("--vpmem-namespace",
+                            help="Namespace name (default: namespace0.0)",
+                            default="namespace0.0")
+    vpmem_group.add_argument("--vpmem-region",
+                            help="Region name (default: region0)",
+                            default="region0")
+
     return parser