Adjust lower-constraints

Changes:
- hacking 0.12.0 -> 1.1.0
  * it was already at >=1.1.0,<1.2.0 in test-req, so updated l-c
- flake8 2.5.5 -> 2.6.0 (for hacking)
- added bandit to test-requirements and l-c
  * needed to set cap for py27

Change-Id: If8a12c18daea9513130a020d01db2c27a93c3cfc

lower-constraints.txt

@@ -2,6 +2,7 @@ alabaster==0.7.10
 appdirs==1.3.0
 asn1crypto==0.23.0
 Babel==2.3.4
+bandit==1.1.0
 castellan==0.16.0
 cffi==1.7.0
 cliff==2.8.0
@@ -16,10 +17,10 @@ eventlet==0.18.2
 extras==1.0.0
 fasteners==0.7.0
 fixtures==3.0.0
-flake8==2.5.5
+flake8==2.6.0
 future==0.16.0
 greenlet==0.4.10
-hacking==0.12.0
+hacking==1.1.0
 idna==2.6
 imagesize==0.7.1
 iso8601==0.1.11

test-requirements.txt

@@ -15,3 +15,5 @@ testtools>=2.2.0 # MIT
 stestr>=1.0.0 # Apache-2.0
 oslo.vmware>=2.17.0 # Apache-2.0
 castellan>=0.16.0 # Apache-2.0
+bandit>=1.1.0;python_version>='3.4'
+bandit>=1.1.0,<=1.6.2;python_version=='2.7'