VOL-1604 Implementing storage of MIB entities in etcd.

Updated tests to work and pulled a test update from https://gerrit.opencord.org/#/c/12815/. The functional changes were merged some time ago, but the test was not.
Updated requirements to match those in voltha-openonu-adapter. This fixed an issue where the test would fail on importing the etcd database class
Change-Id: I13787dbf740020eb2d7f2c6498f9eafe1b461cba
diff --git a/tox.ini b/tox.ini
index 60d0614..d312d51 100644
--- a/tox.ini
+++ b/tox.ini
@@ -23,7 +23,7 @@
    nose
    mock
    coverage
-   -r requirements.txt
+   -rrequirements.txt
 
 [nosetests]
 with-xunit=1