INT-3091 Fix Concurrent (S)FTP Transfers

byte[] and String payloads were written to a temporary file.

If the same message is transferred to two different destinations
concurrently, one of the adapters could remove the temporary
file while the other was using it.

Don't use a temporary file for these payloads, simply use the
payload byte[] [or a String.getBytes()] as the InputStream
passed to the Session.write() method.

Polishing

Polishing - Add WARN For Missing File

+ Test

JIRA: https://jira.springsource.org/browse/INT-3091
INT-3074: JDBC: Make generateSql as UP-TO-DATE

* remove `overwrite: 'true'` from `generateSql` task
* add `cleanSql` task

JIRA: https://jira.springsource.org/browse/INT-3074
INT-3170 Update Project Repo in Root Files

s/SpringSource/spring-projects/
INT-3171: Polishing Aggregator tests

* Increase waiting timeouts
* Get rid of `Thread.sleep` when it's dangerous

JIRA: https://jira.springsource.org/browse/INT-3171