Make MSleep (sleep) never constant so it get executed during query
processing not during parse, so interrupt is handled correctly.
Make MSleep#doEvaluate() check the session canceled on interrupt and
throw a QueryCanceledException if so.
Remove tabs and \r, mostly consistent spacing
merge nathanlws: Consistent whitespace in error_code.properties

Merge pull request #1045 from nathanlws/sql-layer/no-tabs-error-code-poperties
https://github.com/FoundationDB/sql-layer/pull/1045
merge tjoneslo: Msleep not constant

Merge pull request #1046 from tjoneslo/sql-layer/msleep-not-constant
https://github.com/FoundationDB/sql-layer/pull/1046
Merge branch 'master' into nested-call-transactions