Update requirements, else some installation will fail :/

requirements.txt

@@ -1,8 +1,7 @@
 # CherryPy >= 5.1.0 and PyOpenssl == 0.14 (16 seems broken) are required for proper HTTPS setup
 # They are not added as hard dependencie here so that packaging works fine
 # CherryPy is not packaged anymore since v3.5XX so we let it as is.
-# CherryPy<9.0.0
-CherryPy
+CherryPy<9.0.0
 
 # Version <=2.14.2 else some tests using requests-mock are broken with the 2.16.0 version
 # requests>=2.7.0,<=2.14.2
@@ -27,8 +26,7 @@ numpy<1.12.0; python_version < '2.7'
 numpy; python_version >= '2.7'
 
 # SSL between the daemons
-# pyopenssl>=0.15
-pyopenssl
+pyopenssl>=0.15
 
 # docopt is used by the alignak_environment script
 docopt