Karaf upgrade

[radeklawgmin]

The version of Karaf AET makes use of, is old.
There is also a problem with downloading karaf dependencies.

Please take a look at:
malaskowski/aet-docker#17
and
apache/karaf@f48124e#diff-5b7f8f6da56ac973cebda59c29ddbf0776ef15292aa5a590de1e915ed3f035a1

[devzbysiu]

In the end, I did the same thing which was done in aet-docker to make it consistent (and less risky in terms of regression). I simply updated karaf repo configs to use https instead of http.

This can be tested along #630 and #631

[pilarskie]

Tested and accepted.