install-server: Do not install python-ironicclient

The python-ironicclient is not present on OSP, but only on
RDO. Hence we do not install it on RHEL7.
install-server: Export PATH include /usr/local folder

Several programs are installed in /usr/local/{bin,sbin}.
Like ansible or bundle. But the current path does not go look
for those programs, hence PATH needs to be edited.
openstack-common: Do not install augeas temporarily
puppet: Do not install kwalify and augeas on RHEL7
tempest: Install python-openssl only on Debian platforms
install/jenkins: Use apporpriate package name based on EL version

Rake package is called rake in EL6 and rubygem-rake on EL7.
This commit follow this logic.