preparing to split chameleon out of voltha

this is a prep step to make chameleon independent
of voltha. Chameleon will move out of voltha but
repo will drop chameleon in the same place as it
currently is. This means that voltha's build process
will not change and the code changes to chameleon
will automatically be applied to the correct repo.

Change-Id: I754d6b5b28ea99333b19140d6c1a94e8198f9d3a
diff --git a/utils/asleep.py b/utils/asleep.py
new file mode 100644
index 0000000..295f675
--- /dev/null
+++ b/utils/asleep.py
@@ -0,0 +1,28 @@
+#
+# Copyright 2017 the original author or authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+from twisted.internet import reactor
+from twisted.internet.defer import Deferred
+
+
+def asleep(dt):
+    """
+    Async (event driven) wait for given time period (in seconds)
+    :param dt: Delay in seconds
+    :return: Deferred to be fired with value None when time expires.
+    """
+    d = Deferred()
+    reactor.callLater(dt, lambda: d.callback(None))
+    return d
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