deploy checkout unexpected revision when lib not include revision hash

[moshe-shahar]

This issue was introduced in #896.
The library in the cache can point to different branches every time.
On deploy/import/update, adding library at latest revision in the current branch, leads to unexpected revision checkout.
Example: As a result of Jenkins's job, library A in the cache points on branch test, Next job that will import library A without specific revision and expect master branch will end using test branch instead.

[ciarmcom]

Internal Jira reference: https://jira.arm.com/browse/IOTBTOOL-445

[adbridge]

This was closed by the automated bot by mistake - re-opening