Modify caps_helper.py such that calling code does't have to store
returned values just to pass those values again to a method in
caps_helper.py. This is a common pattern where write_test_files()
return 3 values and all 3 passed as it is to run_cap_tests().

The easy way to do it is to upgrade caps_helper so that it can be used
an object and not just as a class supplying helper methods. The return
values will be stored by the object internally and thus resued. In case
of testing multiple FSs inside a single test method, we'll now need
multiple instances of this class to keep those values separate.

And since CapsHelper is not just a class supplying helper methods
anymore, it's being renamed to CapTester.

Signed-off-by: Rishabh Dave <ridave@redhat.com>

Simplify methods in CapsTester by adding a test set, which will be a
list of tuples. The first element in tuple will be the mount object,
the second will be the test file path and the third will be the test
file data. Thus instead of having three independent class variables
that are always used together now we have list of test sets making
management of multiple test sets simpler.

Signed-off-by: Rishabh Dave <ridave@redhat.com>

Let's change the file data to include the file path, the CephFS name
and the host FS and CephFS mountpoint so that the bugs where, let's say,
"cephfs2" is mounted instead of "cephfs1" (where obviously both the
CephFSs lie on the same Ceph cluster) is caught by the tests due to
uniqueness of every test file's content.

Signed-off-by: Rishabh Dave <ridave@redhat.com>

With this commit, the design of run_mon_cap_tests() is now aligned with
rest of CapTester -- it's not meant to be inherited by test class
anymore and it is to be called by using CapTester instance.

This commit also changes working of this method. Now instead of
obtaining FS names from Python objects representing FSs, it obtains
those names from MON cap. This removes the need to pass the FS objects
around.

Signed-off-by: Rishabh Dave <ridave@redhat.com>

The intention is to make logs contain some information of what's being
done by caps_helper.py regardless of which test/method is calling it.
This should make logs more understandable and also add hints for
future debugging.

Signed-off-by: Rishabh Dave <ridave@redhat.com>

caps_helper.py since caps_helper.py has been heavily modified in
previous commits.

setup_fs_contents() is being deleted since it is not used anymore.

Signed-off-by: Rishabh Dave <ridave@redhat.com>

Upgrade test_admin.FsAuthorize to repair its compatibility with
caps_helper.py since caps_hepler.py has been heavily modified in
previous commits.

Signed-off-by: Rishabh Dave <ridave@redhat.com>

test_single_path_rootsquash instead of using helper methods duplicates
the code from those methods. This commit fixes that and also upgrade
this method since caps_helper was upgraded in previous commits.

Signed-off-by: Rishabh Dave <ridave@redhat.com>

Remove setup_test_env() because removing this methods removes an extra
layer of abstraction which makes tests more readable. Rename
_create_client_and_keyring_file() to just _create_client() and reverse
the order of parameters in remount_with_new_client() and set default
value of cephfs_mntpt to '/'.

Signed-off-by: Rishabh Dave <ridave@redhat.com>