Setting the log directory for both packages to /var/log/graylog2.

To do this I combined the contents of ../SOURCES/logrotate.d-graylog2-server and ../SOURCES/logrotate.d-graylog2-web-interface
into one file ../SOURCES/logrotate.d-graylog2. This logrotate file looks for all log files under /var/log/graylog2
and rotates them daily and compresses them.

Setting the log location in SOURCES/sysconfig-graylog2-server and SOURCES/sysconfig-graylog2-web-interface,
so the init scripts will redirect all STDOUT output to /var/log/graylog2/graylog2-server.log and
/var/log/graylog2/graylog2-web-interface.log respectively.

Replacing the origin SOURCE3 in SPECS/graylog2-server.spec and SPECS/graylog2-web-interface.spec with the new
SOURCES/logrotate.d-graylog2 file and creating the log directory /var/log/graylog2.
Removing the config directory from %{_sysconfdir}/%{name} to %{_sysconfdir}/ in SPECS/graylog2-server.spec

After install of the graylog2-server through RPM startup failed because it couldn't find /etc/graylog2.conf.
Simply moving the configuration locations in the spec file to the proper locations.
Creating the /var/run/ directory with parent(s) in SPECS/graylog2-server.spec and SPECS/graylog2-web-interface.spec

Uncommenting the basic variables, (e.g. ctl dir, pid file, etc) in SOURCES/sysconfig-graylog2-server
and SOURCES/sysconfig-graylog2-web-interface.