utils: migrated hostname related code to hostname_util

BUG=None
TEST=Run Test
TEST=CQ Passes

Change-Id: I1352071e4827417e70e0e6b38ad3d9bc12072a74
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/4854198
Commit-Queue: Anuj Jamwal <anujjamwal@google.com>
Tested-by: Anuj Jamwal <anujjamwal@google.com>
Reviewed-by: Alex Klein <saklein@chromium.org>
Auto-Submit: Anuj Jamwal <anujjamwal@google.com>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
diff --git a/scripts/cbuildbot.py b/scripts/cbuildbot.py
index 3597279..df29269 100644
--- a/scripts/cbuildbot.py
+++ b/scripts/cbuildbot.py
@@ -26,6 +26,7 @@
 from chromite.cbuildbot import topology
 from chromite.cbuildbot.stages import completion_stages
 from chromite.lib import builder_status_lib
+from chromite.lib import buildstore
 from chromite.lib import cgroups
 from chromite.lib import cidb
 from chromite.lib import cleanup
@@ -43,7 +44,7 @@
 from chromite.lib import tee
 from chromite.lib import timeout_util
 from chromite.lib import ts_mon_config
-from chromite.lib.buildstore import BuildStore
+from chromite.utils import hostname_util
 
 
 _DEFAULT_LOG_DIR = "cbuildbot_logs"
@@ -155,7 +156,7 @@
         builder_run = cbuildbot_run.BuilderRun(
             options, site_config, build_config, manager
         )
-        buildstore = BuildStore()
+        build_store = buildstore.BuildStore()
         if metadata_dump_dict:
             builder_run.attrs.metadata.UpdateWithDict(metadata_dump_dict)
 
@@ -166,9 +167,9 @@
             else:
                 builder_cls_name = "simple_builders.SimpleBuilder"
             builder_cls = builders.GetBuilderClass(builder_cls_name)
-            builder = builder_cls(builder_run, buildstore)
+            builder = builder_cls(builder_run, build_store)
         else:
-            builder = builders.Builder(builder_run, buildstore)
+            builder = builders.Builder(builder_run, build_store)
 
         try:
             if not builder.Run():
@@ -1116,7 +1117,7 @@
     if (
         options.buildbot
         and not options.debug
-        and not cros_build_lib.HostIsCIBuilder()
+        and not hostname_util.host_is_ci_builder()
     ):
         # --buildbot can only be used on a real builder, unless it's debug.
         cros_build_lib.Die("This host is not a supported build machine.")