Expose the execute_utility function

[asavchkov]

This function should be exposed in the package to be able to reuse it when there is a need to run commands in tests like e.g. this: https://github.com/postgrespro/pg_probackup/blob/22c808312f67a060cda3bb36e5a032784a5810f9/tests/helpers/ptrack_helpers.py#L98

[codecov[bot]]

Codecov Report

Merging #65 (bf249d0) into master (87e9fd5) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #65   +/-   ##
=======================================
  Coverage   96.05%   96.05%           
=======================================
  Files          18       18           
  Lines        1671     1671           
=======================================
  Hits         1605     1605           
  Misses         66       66           

Impacted Files	Coverage Δ
testgres/__init__.py	100.00% <ø> (ø)

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