Remove tripleo control variables

And replace them with a single environment variable "TOCI_JOBTYPE",
toci can then be used to set tripleo control variables outside of the
jenkins job configuration.

This commit should be merged after its counterpart in the infra/config
repository I5ed1a7bb473d9f7183b3a036702a1c71bfc5870d

Change-Id: I58462d3ce3e63ea190c95e2a210c087c978c7d16
Merge "Remove tripleo control variables"