Remove used method get_destination_address().
Merge pull request #223 from LipuFei/candidate-cleanup

Small cleanup for candidate
Removed dispersy controlling the steps
Merge pull request #224 from NielsZeilemaker/remove_dispersy_walker

Removed dispersy controlling the steps
BootstrapCandidates were global, causing interference between
communities.
In Tribler, it prevented the AllChannelCommunity from bootstrapping.
Conflicts:
	community.py
Merge pull request #225 from NielsZeilemaker/devel_bootstrap_fix

BootstrapCandidates were global, causing interference between
Fix for now must be float
Merge pull request #226 from NielsZeilemaker/devel_timeoutfix

Fix for now must be float
Either -1.0 or larger than previous walk response
Merge pull request #227 from NielsZeilemaker/devel_timeoutfix

Either -1.0 or larger than previous walk response