XD-1129: Limit caching of snapshot dependencies.

Sets gradle's resolution strategy for "changing dependencies"
to only cache them for 60 minutes.
XD-1117: First script tests for use in CI build.
XD-1117: Add urlencode of definition in scripts

The CI server has an outdated version of curl which doesn't
support the --data-urlencode option, so we use python instead
to encode the definition before passing it to curl.
Add wait_for_server fn to scripts
Reduce noise from curl
Ensure Boot defaults available for MVC
XD-1128: Add JMX support to parent contexts

Also rely implicitly on Spring Boot to set up the Jolokia
endpoints. Example:

http://localhost:9393/jolokia/search/xd.*:type=*,*

Disable jolokia endpoint by default
XD-1070,XD1071 filehdfs job module fixes

- Add basePath and fileSuffix parameters to module
- Create basePath if necessary
- Improved rollover counter naming in the case where multiple jobs may
  be using the same base path.
- Extend AbstractItemStreamWriter so HDFS stream is closed when job ends
XD-806: Module options validation at the parser level

Add jsr303 validation
XD-1131: Easy support for inputType/outputType as option metadata

Make base classes abstract

Addressed review comments
ModuleDeployer cleanup
XD-1089 Add shell command for job executions

* Add `job execution list` command
* Add `job execution display` command
* Add numerous Jackson MixIns + Deserializer to ensure deserialization of Batch objects
* Add tests
* Shell: Add Table#addRow() helper method (plus test)
* Add helper method CommonUtils#getUtcTime()

Jira: https://jira.springsource.org/browse/XD-1089

XD-1089 Fix slf4j version conflict

* exclude group 'org.slf4j' from dependency `spring-batch-admin-manager` in module `spring-xd-rest-domain`

Cleanup needed
XD-1135 check for local node transport in SingleNodeApplication and refactor SingleNode stream tests
XD-1106: JDBC to HDFS module
XD-1106: Allow use of 'sql' option.

This allows more flexibility than just setting the table and columns.
Also renamed 'names' module to 'columns' for consistency with JDBC sink.
XD-1106: Read column names from result set metadata

The names are cached in the RowMapper on first use and used to create
the tuple.
XD-1106: Use Spring's JdbcUtils for reading result set
XD-1106: Fix regex group in AbstractHdfsItemWriter
XD-1106: Reset item writers initialization flag when item writer closes
XD-1133: HDFS import-export script tests

Test 3 reproduces the error seen when undeploying/redeploying
a stream using the HDFS sink.