Refactor dependencies

[lrog]

Updated dependencies for:

• logging
• Apache Commons
• gson
• joda
• ElasticSearch with minor compatibility fixes
• GATE to 8.4.1 (**1)
• TIKA (**2)
• databases + connectors: hsqldb , mysqldb , postgresql ,
• testing: mockito
• multiple Spring dependencies
• Groovy
• Gradle build + wrapper

Ad. 1) gate-core has been updated to version 8.4.1 and not the newest one 8.5, as the usage of GATE inside the Pipeline will be deprecated. It is kept for now only for the backward compatibility.

Ad. 2) Apache Tika has been updated to the newest version 1.19.1 and it can support now the newest version of Tesseract OCR in v. 4.0.

There are some key points to keep in mind:

• The newest version of Tesseract has been already published as release candidate and it will be downloaded by default for Debian > stretch.
• In order to use the older version 3.x of Tesseract one needs to either compile it locally or download it explicitly from older PPA repository (e.g. stretch).
• Trying to run CogStack Pipeline using the older Tika dependencies (< 1.17) on newer Debian distributions will cause errors – it is trying to run Tesseract 4.0 (unsupported) which is installed by default.

In addition, also changed in the integration and acceptance tests the elasticsearch+kibana stack to be based on the -oss image, which does not use x-pack.

[afolarin]

LGTM.