Updated basics for installation, including RHEL-specific info.
Updated basics for installation, including RHEL-specific info.

Fixed mysql command for setting initial password. Added EPEL
install for openstack-utils dependencies. Fixed one typo.

Change-Id: If18683f4029f2f933dd97d808ae291b8cff310e5

AlekhyaMallina-Vedams/openstack-manuals,openstack/openstack-manuals,Akasurde/openstack-manuals,saeki-masaki/openstack-manuals,potsmaster/openstack-manuals,kairoaraujo/openstack-manuals,openstack/openstack-manuals,saeki-masaki/openstack-manuals,gongysh2004/openstack-manual,openstack/openstack-manuals,gongysh2004/openstack-manual,AlekhyaMallina-Vedams/openstack-manuals,potsmaster/openstack-manuals,openstack/openstack-manuals,kairoaraujo/openstack-manuals,Akasurde/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals