Bug 2064 fixed

Removed the unnecessary verification for if the repo_url exists in the
method get_scale_count of the Helm Base Connection class; The same
problem also applies for the scale method, so this verification was also
removed there;
Also did some fixes/additions to the description of some methods being called
in this verification block.

Change-Id: I710b8678b4b70c6f24c2150d44bb714e9e4c5b66
Signed-off-by: Pedro Escaleira <escaleira@av.it.pt>