Two improvements.
1) Extend build avoidance to work with any build type,
and built in any order.
Previously build avoidance did not support build types other
than 'std' and 'rt', and only supported thos properly
if both 'std' and 'rt' are built at the same time.
2) Allow for a build avoidance config that does not specify
a host. In this mode the reference build must be on the same
machine. The envisioned use case is to allow a build server
to use build avoidance internally for faster builds, without
potentially exposing an rsync port on the network.
Story: 2006166
Task: 39207
Signed-off-by: Scott Little <scott.little@windriver.com>
Change-Id: Idbd87bcc7683746d7b2ff8ac7488919c4a406b50
61ef1d4124