Added pillar.api.utils.utcnow() which returns a datetime for 'now'

This replaces pillar.web.utils.datetime_now() and can be used in a wider
setting (since we don't import web stuff in the api, but we do vice versa).

pillar/api/utils/__init__.py

@@ -10,6 +10,7 @@ import typing
 import urllib.request, urllib.parse, urllib.error
 
 import bson.objectid
+import bson.tz_util
 from eve import RFC1123_DATE_FORMAT
 from flask import current_app
 from werkzeug import exceptions as wz_exceptions
@@ -200,3 +201,7 @@ def random_etag() -> str:
 
     randbytes = random.getrandbits(256).to_bytes(32, 'big')
     return base64.b64encode(randbytes)[:-1].decode()
+
+
+def utcnow() -> datetime.datetime:
+    return datetime.datetime.now(tz=bson.tz_util.utc)