change default to 2.1, new 2.1 cassadra.yaml file
add notes about params not used in 2.1 for priam
correct filename reference for new 2.1 C* yaml
default Priam to the 2.1 patched tree
C* 2.1 init script for that version.
stop referencing uwaterloo mirror as it is not reliable
small fix to C* 2.1 init for where we install, also force 1 token per not as is the case for Priam
new take on vagrant execution. should be less flakey
Vagrant file seems to be in better shape now, no complaints on a few combinations of tests. (never provisioned, reprovisioning, erase .vagrant and VM and restart, etc)