Fix profile env variable name regression

In the effort of adapting to the latest snapper in Issue #2697
we overlooked the after effect of a different variable name
in the profile environment with regards to $kiwi_btrfs_root_is_snapshot
and $kiwi_btrfs_root_is_snapper_snapshot. Image builds that
references the former variable name would be broken by the change.
This commit makes sure no regression is introduced by providing
both variants. This Fixes bsc#1237772

Author: schaefi

kiwi/system/profile.py

@@ -322,6 +322,8 @@ def _type_to_profile(self):
             self.xml_state.get_build_type_bootloader_console()[0] or 'default',
             self.xml_state.get_build_type_bootloader_console()[1] or 'default'
         )
+        self.dot_profile['kiwi_btrfs_root_is_snapshot'] = \
+            type_section.get_btrfs_root_is_snapper_snapshot()
         self.dot_profile['kiwi_btrfs_root_is_snapper_snapshot'] = \
             type_section.get_btrfs_root_is_snapper_snapshot()
         self.dot_profile['kiwi_gpt_hybrid_mbr'] = \

test/unit/system/profile_test.py

@@ -49,6 +49,7 @@ def test_create_live(self, mock_which):
             'kiwi_firmware': 'bios',
             'kiwi_bootloader': 'grub2',
             'kiwi_bootloader_console': 'default:default',
+            'kiwi_btrfs_root_is_snapshot': None,
             'kiwi_btrfs_root_is_snapper_snapshot': None,
             'kiwi_gpt_hybrid_mbr': None,
             'kiwi_devicepersistency': None,
@@ -137,6 +138,7 @@ def test_create_oem(self, mock_which):
             'kiwi_ramonly': True,
             'kiwi_initrd_system': 'dracut',
             'kiwi_install_volid': 'INSTALL',
+            'kiwi_btrfs_root_is_snapshot': None,
             'kiwi_btrfs_root_is_snapper_snapshot': None,
             'kiwi_gpt_hybrid_mbr': None,
             'kiwi_showlicense': None,

test/unit/tasks/image_info_test.py

@@ -151,6 +151,7 @@ def test_process_image_info_print_kiwi_env(self, mock_out):
                         ('kiwi_bootloader_console', 'default:default'),
                         ('kiwi_bootprofile', ''),
                         ('kiwi_btrfs_root_is_snapper_snapshot', ''),
+                        ('kiwi_btrfs_root_is_snapshot', ''),
                         ('kiwi_cmdline', ''),
                         ('kiwi_compressed', ''),
                         ('kiwi_delete', ''),