Fix boto capabilities check
Fix boto capabilities check

In commit 4845fc27 a capability check for the boto library has been
accidentally broken. boto.connection existed in all versions and it
was HTTPResponse class that should cause the ImportError.
Exception will not happen on the import line anymore, so check the
capabilities using hasattr() instead.

Change-Id: Ic9bff71b91de685a958400f12836322c7ca996c4

n0ano/gantt,n0ano/gantt