Have the log.error() in POS log only the error message, not the full
stack trace.
Replace the global log at error - use the InvalidOperationException
code.logAtImportance()
Fix the call to logAtImportance() to avoid unexpected error, 
Add a new test to show (even manually) the process is working as
expected.
merge tjoneslo: Make pgerror logging less invasive

Merge pull request #1535 from tjoneslo/sql-layer/make-pgerror-logging-less-invasive
https://github.com/FoundationDB/sql-layer/pull/1535
Split REST services out into a separate plugin.
Make more tests based on plugin test base.
It isn't going to work to know about HttpServletRequest here. Pass in security pieces.
Need routine firewall at test time to call procs.
Copy build results into plugins dir for developer use and thence into packages.
Make the plugins prefix be fdbsql for greater consistency.
Output encoding got lost in shuffle.
Rename restdml service under rest package.
Straighten out required services.
Gut the plugins subsystem in favor of simple services discovery via resources in the classpath, to which any plugins are added.
This means that plugin authors have to take responsibility for not stomping on properties, etc.
Almost all the bindAndRequire calls in plugin tests could be require if that existed; they are just overriding the requirement, not the binding. So add it.
Quiet down tests.