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Eclipse Kura Installation hangs when adding maven repository

See original GitHub issue

Bug Description

The Eclipse Installer hangs when trying to install Eclipse Kura. The error occurs when trying to add the http://repo1.maven.org/maven2/.m2e/connectors/m2eclipse-tycho/0.9.0/N/LATEST/ repository, as that URL needs to be accessed via HTTPS as of 15. January 2020.

To Reproduce Steps to reproduce the behavior (from Eclipse Kura README):

Start the Eclipse Installer
Switch to advanced mode
Select “Eclipse for Committers” and configure the “Product Version”, then select a JRE 1.8+ and press the Next button
Select the Eclipse Kura installer from the list.
Select the “Developer Type”.
Update Eclipse Kura Git repository username and customize further settings if you like (e.g. Root install folder, Installation folder name)
Leave all Bootstrap Tasks selected and press the Finish button
Once you accept the license you will see the following error message in the log:

ERROR: org.eclipse.equinox.p2.transport.ecf code=1002 HTTP Server 'Not Implemented': http://repo1.maven.org/maven2/.m2e/connectors/m2eclipse-tycho/0.9.0/N/LATEST/content.xml
ERROR: org.eclipse.ecf.identity code=0 HttpComponents connection error response code 501.
  at org.eclipse.ecf.provider.filetransfer.httpclient45.HttpClientFileSystemBrowser.runRequest(HttpClientFileSystemBrowser.java:276)
  at org.eclipse.ecf.provider.filetransfer.browse.AbstractFileSystemBrowser$DirectoryJob.run(AbstractFileSystemBrowser.java:69)
  at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63)