cephadm: `ceph-volume` should raise fsid mismatch

cephadm: `ceph-volume` should raise fsid mismatch

raise an fsid mismatch error when passed differing fsids via `--fsid` and `--config`:

```
self = <tests.test_cephadm.TestCephVolume object at 0x7f1c711961f0>, cephadm_fs = <pyfakefs.fake_filesystem.FakeFilesystem object at 0x7f1c713addc0>

    def test_fsid(self, cephadm_fs):
        cv_cmd = ['--', 'inventory', '--format', 'json']
        fsid = '00000000-0000-0000-0000-0000deadbeef'

        cmd = ['ceph-volume', '--fsid', fsid] + cv_cmd
        with with_cephadm_ctx(cmd) as ctx:
            cd.command_ceph_volume(ctx)
            assert ctx.fsid == fsid

        s = get_ceph_conf(fsid=fsid)
        f = cephadm_fs.create_file('ceph.conf', contents=s)

        cmd = ['ceph-volume', '--fsid', fsid, '--config', f.path] + cv_cmd
        with with_cephadm_ctx(cmd) as ctx:
            cd.command_ceph_volume(ctx)
            assert ctx.fsid == fsid

        cmd = ['ceph-volume', '--fsid', '10000000-0000-0000-0000-0000deadbeef', '--config', f.path] + cv_cmd
        with with_cephadm_ctx(cmd) as ctx:
            err = 'fsid does not match ceph.conf'
            with pytest.raises(cd.Error, match=err):
                cd.command_ceph_volume(ctx)
>               assert ctx.fsid == None
E               AssertionError: assert '10000000-0000-0000-0000-0000deadbeef' == None
E                +  where '10000000-0000-0000-0000-0000deadbeef' = <cephadm.CephadmContext object at 0x7f1c7121c1c0>.fsid
```

Signed-off-by: Michael Fritch <mfritch@suse.com>