Add option to suppress printing the changelog during publishing
Add option to suppress printing the changelog during publishing

When publishing (particularily when publishing named snapshots from a CI
job) the changelog output can be quite verbose, and not actually read by a
human.  With this option, we can have more concise output.

Testing Done:
After:
======
```
[prometheus pants (areitz/add_changelog_suppress_option)]$ PANTS_DEV=1 ./pants publish examples/src/scala/org/pantsbuild/example:jvm-run-example-lib --no-publish-dryrun --publish-named-snapshot=areitz_test --publish-local=~/Desktop --no-publish-print-changelog
*** Running pants in dev mode from /Users/areitz/workspace/pants/src/python/pants/bin/pants_exe.py ***
INFO] Detected git repository at /Users/areitz/workspace/pants on branch areitz/add_changelog_suppress_option

14:51:48 00:00 [main]
...
14:51:48 00:00   [publish]
14:51:48 00:00     [publish]
                   Skipping check for a clean areitz/add_changelog_suppress_option branch in test mode.
Publish org.pantsbuild.example#hello-greet with revision Namedver(areitz_test) ? [y|N] y

14:51:58 00:10       [jar-tool]
14:51:58 00:10       [jar-tool]
14:51:58 00:10       [jar-publish]WARN] Scrubbing JAVA_TOOL_OPTIONS=-Dfile.encoding=utf8

Publish org.pantsbuild.example.hello#welcome with revision Namedver(areitz_test) ? [y|N] y
...
```

Reviewed at https://rbcommons.com/s/twitter/r/2140/

dturner-tw/pants,ericzundel/pants,megaserg/pants,wisechengyi/pants,sameerparekh/pants,pantsbuild/pants,mateor/pants,tdyas/pants,areitz/pants,laurentgo/pants,15Dkatz/pants,kwlzn/pants,lahosken/pants,di0spyr0s/pants,foursquare/pants,pombredanne/pants,foursquare/pants,benjyw/pants,15Dkatz/pants,fkorotkov/pants,wisechengyi/pants,slyphon/pants,ity/pants,dbentley/pants,slyphon/pants,wisechengyi/pants,UnrememberMe/pants,UnrememberMe/pants,pantsbuild/pants,qma/pants,15Dkatz/pants,digwanderlust/pants,landism/pants,UnrememberMe/pants,Gabriel439/pants,15Dkatz/pants,mateor/pants,foursquare/pants,jessrosenfield/pants,kslundberg/pants,sid-kap/pants,di0spyr0s/pants,jessrosenfield/pants,jtrobec/pants,benjyw/pants,sameerparekh/pants,dturner-tw/pants,jtrobec/pants,foursquare/pants,Gabriel439/pants,gmalmquist/pants,wisechengyi/pants,pantsbuild/pants,megaserg/pants,jsirois/pants,pombredanne/pants,benjyw/pants,twitter/pants,gmalmquist/pants,kslundberg/pants,baroquebobcat/pants,areitz/pants,manasapte/pants,sid-kap/pants,ity/pants,cevaris/pants,gmalmquist/pants,tdyas/pants,ity/pants,qma/pants,kslundberg/pants,gmalmquist/pants,qma/pants,fkorotkov/pants,kwlzn/pants,areitz/pants,scode/pants,baroquebobcat/pants,kwlzn/pants,megaserg/pants,landism/pants,peiyuwang/pants,scode/pants,peiyuwang/pants,di0spyr0s/pants,areitz/pants,benjyw/pants,lahosken/pants,kwlzn/pants,TansyArron/pants,ericzundel/pants,sid-kap/pants,qma/pants,megaserg/pants,foursquare/pants,ity/pants,ericzundel/pants,kwlzn/pants,scode/pants,foursquare/pants,pombredanne/pants,laurentgo/pants,dbentley/pants,mateor/pants,UnrememberMe/pants,laurentgo/pants,TansyArron/pants,qma/pants,jtrobec/pants,dbentley/pants,landism/pants,jessrosenfield/pants,twitter/pants,megaserg/pants,mateor/pants,TansyArron/pants,peiyuwang/pants,TansyArron/pants,baroquebobcat/pants,pantsbuild/pants,jessrosenfield/pants,lahosken/pants,ericzundel/pants,peiyuwang/pants,areitz/pants,wisechengyi/pants,manasapte/pants,slyphon/pants,megaserg/pants,lahosken/pants,twitter/pants,landism/pants,digwanderlust/pants,mateor/pants,twitter/pants,scode/pants,fkorotkov/pants,pantsbuild/pants,fkorotkov/pants,kslundberg/pants,jsirois/pants,pgroudas/pants,TansyArron/pants,peiyuwang/pants,benjyw/pants,laurentgo/pants,twitter/pants,kslundberg/pants,kslundberg/pants,benjyw/pants,pombredanne/pants,foursquare/pants,manasapte/pants,twitter/pants,Gabriel439/pants,dbentley/pants,foursquare/pants,tdyas/pants,baroquebobcat/pants,pombredanne/pants,laurentgo/pants,TansyArron/pants,dturner-tw/pants,gmalmquist/pants,sid-kap/pants,landism/pants,lahosken/pants,jtrobec/pants,slyphon/pants,pgroudas/pants,tdyas/pants,sameerparekh/pants,sid-kap/pants,jtrobec/pants,di0spyr0s/pants,15Dkatz/pants,peiyuwang/pants,Gabriel439/pants,ity/pants,fkorotkov/pants,kwlzn/pants,pombredanne/pants,ericzundel/pants,pgroudas/pants,twitter/pants,scode/pants,di0spyr0s/pants,laurentgo/pants,baroquebobcat/pants,areitz/pants,tdyas/pants,pgroudas/pants,cevaris/pants,kslundberg/pants,mateor/pants,dturner-tw/pants,peiyuwang/pants,fkorotkov/pants,cevaris/pants,slyphon/pants,dbentley/pants,peiyuwang/pants,mateor/pants,gmalmquist/pants,dturner-tw/pants,sameerparekh/pants,pgroudas/pants,15Dkatz/pants,foursquare/pants,digwanderlust/pants,qma/pants,digwanderlust/pants,wisechengyi/pants,kwlzn/pants,tdyas/pants,digwanderlust/pants,jtrobec/pants,baroquebobcat/pants,ericzundel/pants,Gabriel439/pants,tdyas/pants,tdyas/pants,ericzundel/pants,landism/pants,landism/pants,qma/pants,twitter/pants,dbentley/pants,tdyas/pants,manasapte/pants,lahosken/pants,ity/pants,pantsbuild/pants,UnrememberMe/pants,di0spyr0s/pants,sid-kap/pants,wisechengyi/pants,fkorotkov/pants,UnrememberMe/pants,sameerparekh/pants,di0spyr0s/pants,jessrosenfield/pants,cevaris/pants,pgroudas/pants,sameerparekh/pants,UnrememberMe/pants,gmalmquist/pants,wisechengyi/pants,sid-kap/pants,lahosken/pants,landism/pants,TansyArron/pants,twitter/pants,Gabriel439/pants,manasapte/pants,baroquebobcat/pants,dturner-tw/pants,UnrememberMe/pants,jtrobec/pants,pantsbuild/pants,15Dkatz/pants,cevaris/pants,mateor/pants,manasapte/pants,dbentley/pants,slyphon/pants,slyphon/pants,lahosken/pants,sameerparekh/pants,scode/pants,wisechengyi/pants,cevaris/pants,jessrosenfield/pants,digwanderlust/pants,ericzundel/pants,jessrosenfield/pants,jsirois/pants,pombredanne/pants,baroquebobcat/pants,UnrememberMe/pants,baroquebobcat/pants,scode/pants,cevaris/pants,manasapte/pants,megaserg/pants,dturner-tw/pants,ity/pants,benjyw/pants,15Dkatz/pants,areitz/pants,fkorotkov/pants,Gabriel439/pants