Remove older RBE tooling versions that are no longer used

Largely a cleanup to save space

Test: live/latest point to the version that's currently checked in
kousikk@altonimbus:~/tmp/remoteexecution-client$ ls -l live latest
lrwxrwxrwx 1 kousikk primarygroup 14 May 13 18:37 latest -> 0.12.2.188e34a
lrwxrwxrwx 1 kousikk primarygroup 14 May 13 18:37 live -> 0.12.2.188e34a

Change-Id: Ia13552e5c698f036679e1f2db417b2f6871d4152
49 files changed