Add pgprimaryvertex check script

See merge request !2516

(cherry picked from commit eb89bf23)

73cc313c add script for use in tests to see if output of step contains the pg primary vertex
d45707c7 Fixed formatting
0e3a4aaf add copyright
93794800 default to logging instead of print
ed2a195f Fixed formatting
02d55183 replace logging with log
9b24fcd2 Fixed formatting