Using of $(PRODUCT_VERSION) dependent upstream mirrors

This feature allows to freeze version of upstream mirrors
for each version of product separately.

(cherry-picked from commit 4ec9e1b6108e4fbcb97d72a8c25d260770fca32b)
Closes-Bug: #1377125
Change-Id: I2df5fe9c00aad06dd355c4ea0c956648f0ce2eaf