Added PoC of the versions support (no proper propagation to Environment)

Signed-off-by: Oleg Nenashev <nenashev@synopsys.com>
Added check of the version variable availability

Signed-off-by: Oleg Nenashev <nenashev@synopsys.com>
Fixed tests

Signed-off-by: Oleg Nenashev <nenashev@synopsys.com>
Fixed appearance of Custom Tools Install Wrapper

Signed-off-by: Oleg Nenashev <nenashev@synopsys.com>
Fixed injection of default versions into the build environment.

Signed-off-by: Oleg Nenashev <nenashev@synopsys.com>
Fixed list of the possible tools

Signed-off-by: Oleg Nenashev <nenashev@synopsys.com>
Merge pull request #9 from synopsys-arc-oss/tool-versions

[FIXED JENKINS-18772] - Versions support (no proper propagation to Environment)