install: options for syslog and context

bug 1112831
https://bugzilla.redhat.com/show_bug.cgi?id=1112831

The administrative guide describes how to enable centralized logging.
This enhancement adds options to deploy with this configuration.
install: add yum_exclude_pkgs option

Sometimes we work with large yum repos that can be incompletely synced
such that the indices point to files that aren't there yet. Work around
this during development installs by simply excluding problem packages.
install: add option to enable metrics by watchman
Merge pull request #383 from sosiouxme/enterprise-2.1-logging

Enterprise 2.1 logging
install: custom selinux module for mmopenshift

https://bugzilla.redhat.com/show_bug.cgi?id=1117360

If selinux-policy is not sufficiently updated, install an SELinux policy
module to enable rsyslog7-mmopenshift if needed per bug 1096155.
Merge pull request #398 from sosiouxme/enterprise-2.1-logging

install: custom selinux module for mmopenshift