upgrade deps for pbr upgrade

install/requirements.txt

@@ -34,7 +34,7 @@ pbr==3.1.1
 prettytable==0.7.2
 py4j==0.10.1
 pyasn1==0.1.9
-pyparsing==2.0.3
+pyparsing==2.1.0
 python-dateutil==2.5.3
 python-editor==1.0.1
 python-ldap-test==0.2.1
@@ -44,7 +44,7 @@ requests==2.10.0
 six==1.8.0
 speaklater==1.3
 sprox==0.9.4
-stevedore==1.1.0
+stevedore==1.20.0
 tg.devtools==2.3.7
 tgapp-resetpassword==0.2.0
 tgext.admin==0.6.4