Implement Channel Reopening

[srdtrk]

Problem Summary

Once a channel is closed due to timeout, or other reasons. Add the ability to reopen it.

Description

Once a channel is closed due to timeout, or other reasons, there should be a path to reopen it. This reopened channel should have the same ica address as the closed channel.

Tasks

• Implement the feature in a feature branch.
• Write end to end tests for it.

[srdtrk]

No new code had to be added to the contract. The newly added end to end test verifies that channel reopening works using the same ica address.