ceph-volume: Fix splitting with too many parts

The data can be anything and also contain a `=`, causing the line to
fail with `Too many values to unpack`. In my case, it failed with
`ID_FS_LABEL=pvc_name=rook-ceph-lvm-data-44f2gc`.

Regression was introduced here: ceph#60006

Fixes: https://tracker.ceph.com/issues/71101

Signed-off-by: Janne Heß <[email protected]>
(cherry picked from commit 315fb96)

Author: dasJ

src/ceph-volume/ceph_volume/tests/util/test_disk.py

@@ -682,6 +682,7 @@ def setUp(self) -> None:
 E:DM_LV_LAYER=
 E:NVME_HOST_IFACE=none
 E:SYSTEMD_READY=1
+E:ENV_WITH_EQUALS_SIGN=test=abc
 G:systemd
 Q:systemd
 V:1"""
@@ -763,4 +764,4 @@ def test_slashed_path_with_bare_device(self) -> None:
     @patch('ceph_volume.util.disk.os.minor', Mock(return_value=0))
     @patch('ceph_volume.util.disk.os.major', Mock(return_value=999))
     def test_dashed_path_with_bare_device(self) -> None:
-        assert disk.UdevData(self.fake_device).dashed_path == '/dev/cephtest'
+        assert disk.UdevData(self.fake_device).dashed_path == '/dev/cephtest'

src/ceph-volume/ceph_volume/util/disk.py

@@ -1396,7 +1396,7 @@ def __init__(self, path: str) -> None:
             if data_type == 'I':
                 self.id = data
             if data_type == 'E':
-                key, value = data.split('=')
+                key, value = data.split('=', maxsplit=1)
                 self.environment[key] = value
             if data_type == 'G':
                 self.group = data