Add FORMULA_PKG_REVISION parameter

After patch [1] being merged it is possible to set
formula revision in pipeline, this patch adds ability
to pass parameter to pipeline. If parameter is left
empty, it will be ignored by pipeline.

[1] https://gerrit.mcp.mirantis.net/#/c/10623/

Change-Id: Ifb57ae0cd2640d256fc2adc751448f07de668781
Related-Prod: PROD-14859
1 file changed