[Bug] InteractiveShell should close when exiting the context manager

[JacobCallahan]

Hussh Version
0.1.7

Describe the bug
When a user is executing a command that doesn't terminate on its own (or within the timeframe expected), like tailing a file, Hussh will timeout when trying to read during the context manager exit.

To Reproduce
Steps to reproduce the behavior:

with conn.shell() as sh:
    sh.send("foreman-tail")
    time.sleep(5)
assert sh.result.stdout

Expected behavior
The context manager should exit cleanly and the result attribute populate correctly. This would likely involve explicitly closing the connection.