Issue 566: Including operator base version in Makefile

[SrishT]

Signed-off-by: SrishT [email protected]

Change log description

Hardcodes the base version of the operator in the Makefile, which needs to be updated after every pravega operator release, to serve as the base version.

Purpose of the change

Fixes #566

What the code does

Hardcodes the pravega operator base version in the Makefile to compute the version for pravega operator images that are build using make build-image command.
The final version for the pravega operator is computed in the following format inside the Makefile

{base_version}-{number_of_commits}-{commit_id}

How to verify it

Running the command make build-image should build the pravega operator image with version in the desired format

[codecov-commenter]

Codecov Report

Merging #567 (0f883c5) into master (01b7755) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #567   +/-   ##
=======================================
  Coverage   73.29%   73.29%           
=======================================
  Files          15       15           
  Lines        4093     4093           
=======================================
  Hits         3000     3000           
  Misses        967      967           
  Partials      126      126           

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[anishakj]

LGTM