tests: Skip filesystem tests if kernel module is not available

We need to be able to mount the filesystems for most of the tests
so it makes sense to just skip the test if we have the userspace
tools but not the kernel module needed for mounting.

tests/fs_tests/fs_test.py

@@ -61,6 +61,9 @@ def setUpClass(cls):
         except:
             cls.f2fs_avail = False
 
+        if not BlockDev.utils_have_kernel_module("f2fs"):
+            cls.f2fs_avail = False
+
         try:
             cls.nilfs2_avail = BlockDev.fs_is_tech_avail(BlockDev.FSTech.NILFS2,
                                                          BlockDev.FSTechMode.MKFS |
@@ -69,6 +72,9 @@ def setUpClass(cls):
         except:
             cls.nilfs2_avail = False
 
+        if not BlockDev.utils_have_kernel_module("nilfs2"):
+            cls.nilfs2_avail = False
+
         try:
             cls.exfat_avail = BlockDev.fs_is_tech_avail(BlockDev.FSTech.EXFAT,
                                                         BlockDev.FSTechMode.MKFS |
@@ -88,6 +94,9 @@ def setUpClass(cls):
         except:
             cls.btrfs_avail = False
 
+        if not BlockDev.utils_have_kernel_module("btrfs"):
+            cls.btrfs_avail = False
+
         try:
             cls.udf_avail = BlockDev.fs_is_tech_avail(BlockDev.FSTech.UDF,
                                                       BlockDev.FSTechMode.MKFS |