* Adds ipa_memcached SystemV initscript
* Adds ipa_memcached service file and tmpfiles.d/ipa.conf
to recreate /var/run/ipa_memcached on reboot.
* Adds ipa_memcached config file
* Adds memcacheinstnace.py to manage ipa_memcaced as
as SimpleService object.
* Updates the IPA service list to include ipa_memcached,
at service positon 39, httpd is position 40
* Updates the spec file:
- requires the memcached daemon and python client
- installs service or initscripts depending on OS
- installs config file
- creates /var/run/ipa_memcached directory
* Modifies ipa-server-install to install ipa_memcached
