Initial log framework

Also:

- Renamed voltha.py to main.py (due to module collision)
- Added logging related dependencies
- Twisted loop
diff --git a/requirements.txt b/requirements.txt
index 06454ac..486202b 100755
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,6 +2,7 @@
 colorama>=0.2.5
 decorator>=3.4.0
 flake8>=2.5.1
+fluent-logger>=0.4.3
 nose>=1.3.7
 mock>=1.3.0
 netifaces>=0.10.4
@@ -14,9 +15,9 @@
 PyYAML>=3.10
 requests
 scapy>=2.3.2
+service-identity
 simplejson>=3.8.1
 six>=1.10.0
+structlog>=16.1.0
 Twisted>=13.2.0
 urllib3>=1.7.1
-
-