Bug 2065 fixed

Bug 2065 fixed

The method _exec_inspect_command is only obtaining the repo name
where an URL was passed: this will allow to scale KDUs based on local
Helm Charts; did also some refactor work: the _split_repo method now
returns both the Chart's name and Repo's name, in order to avoid using
similar blocks of code in other portions (with this, made some changes
to the _exec_inspect_command and _find_repo methods, to use this method,
instead of a similar block of code); added some information to the
description of some changed methods; other small changes.

Change-Id: I7302623ad2bfeef9be3b7c17376cab67f5eda630
Signed-off-by: Pedro Escaleira <escaleira@av.it.pt>