remove pep8 and strict lxml version from setup.py
remove pep8 and strict lxml version from setup.py

Change-Id: I671f3e924641cdfdfb5d20d0b0e3c77e1dc714e2

noironetworks/networking-cisco,cisco-openstack/networking-cisco,nikolay-fedotov/networking-cisco,hareeshpc/networking-cisco,cisco-openstack/networking-cisco,Tehsmash/networking-cisco-nexus,Tehsmash/networking-cisco-apic,Gitweijie/first_project,CiscoSystems/networking-cisco,Tehsmash/networking-cisco,Tehsmash/networking-cisco,Gitweijie/first_project,openstack/networking-cisco,openstack/networking-cisco,noironetworks/networking-cisco,hareeshpc/networking-cisco,CiscoSystems/networking-cisco