pep8
pep 8 editing
Set email_contact to "" if None
pep8 (visual) in dnsutils
pep8 in cyder/base
pep8 in cyder/core/cyuser
pep8 in cyder/core/ctnr
pep8 in cyder/core/system
pep8 in cyder/core
Fix log-servers and slp-directory-agent

_aa_log_servers() had an incorrect error message;
_aa_slp_directory_agent() had an incorrect error message and called the
wrong validation function.
pep8 in cyder/search
pep8 in cyder/cydhcp/build
pep8 in cyder/cydhcp/network & missed file in core/ctnr
pep8 in cyder/cydhcp/range & cyder/cydhcp/lib
pep8 in cyder/cydhcp/vlan & cyder/cyhcp/interface
pep8 in cyder/cydhcp/site & /vrf
pep8 in cyder/cydhcp
pep8 cyder/ & cyder/scripts
Fix some option name and grammar mistakes
Set allow to '' instead of None