Jenkinseditor update site is current

Update the jenkinseditor update site

eclipse 2021-06 and 2021-09

Added new eclipse release and did minor corrections for update urls and using travis-ci.com

GROG.package update

GROG.package version was bumped and dnf package manager is also considered for packages to be installed (dnf_ignore: yes) to work with CentOS/8

Support for 2019-12 and 2020-03

added support for eclipse 2019-12 and 2020-03
removed support for older eclipse versions, that have not been tested anymore and cause trouble with java and some common plugins anyways

fixed pydev certificate import for java 8

java 8's keytool does not support flag '-cacerts' anymore

removed '-cacerts' in check for already imported pydev certificate

install java with proper privilege

v2.1.1

java installed with sudo priviliges #8