lib: chromeos_version: Move ChromeOS VersionInfo class from cbuildbot

Move ChromeOS VersionInfo class to chromeos_version from cbuildbot. Update the
clients to import the class from chromeos_version.

BUG=b:234765273
TEST=CQ

Change-Id: Idaaee31cd9d167ee1f38c7a1fced62d39a823c79
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/3691367
Auto-Submit: Ram Chandrasekar <rchandrasekar@google.com>
Commit-Queue: Cindy Lin <xcl@google.com>
Commit-Queue: Ram Chandrasekar <rchandrasekar@google.com>
Tested-by: Ram Chandrasekar <rchandrasekar@google.com>
Reviewed-by: Cindy Lin <xcl@google.com>
diff --git a/service/packages_unittest.py b/service/packages_unittest.py
index a457921..8aa450c 100644
--- a/service/packages_unittest.py
+++ b/service/packages_unittest.py
@@ -21,8 +21,8 @@
     REPLICATION_TYPE_FILTER,
     ReplicationConfig,
 )
-from chromite.cbuildbot import manifest_version
 from chromite.lib import build_target_lib
+from chromite.lib import chromeos_version
 from chromite.lib import constants
 from chromite.lib import cros_build_lib
 from chromite.lib import cros_test_lib
@@ -1118,10 +1118,10 @@
     # return it.
     test_platform_version = '12575.0.0'
     test_chrome_branch = '75'
-    version_info_mock = manifest_version.VersionInfo(test_platform_version)
+    version_info_mock = chromeos_version.VersionInfo(test_platform_version)
     version_info_mock.chrome_branch = test_chrome_branch
     self.PatchObject(
-        manifest_version.VersionInfo,
+        chromeos_version.VersionInfo,
         'from_repo',
         return_value=version_info_mock)
     test_full_version = 'R' + test_chrome_branch + '-' + test_platform_version