Revert "Add the test for HTTPPROXY"

This reverts commit 576f0bfc0fe0143c4129cb494f698dd1d4f7b697.

The proxy information will be removed at next commit.

re #6707
Revert "Add support for proxy settings for https"

This reverts commit c24669e16be2c848f7bba17c15d6533fc1cf6b94.

Remove all the instances for the httpproxy element.

re #6707
Merge remote-tracking branch 'origin/feature/6707_remove_proxy'