update buildout and setup for developing on rockstor 2.0
Add more dependencies to buildout
Add -f for pool creation low level code
Use systemctl instead of chkconfig for nfs service
rename centos-reqs to the more accurate rpm-deps
disable nginx with systemctl
Merge pull request #344 from schakrava/issue#342_2.0_baseline

update buildout and setup for developing on rockstor 2.0