in recv, make sure all frames are read from the same channel

[merutak]

my tests show that this solves #97

[auvipy]

is it possible for you to add some test/do some test for this pr?

[merutak]

@auvipy I wouldn't hold my breath :/ For now I couldn't even get it to compile on my machine (there are several (closed) tickets about Ubuntu/Debian compilation difficulties, I ran into them).
Also I'm not sure how to write the test using Python wrappers. The test should go something like this, if somebody can get to do it:
Scenario 1: Client opens two channels. Client sends a valid message on each channel, but makes sure to first send just the method (on each channel) and then the rest. Without the fix, this is expected to fail.
Scenario 2: Client opens two channels. Client sends a method + header on one channel, and then method+header+contents on the other channel. (And then completes the first message). This is also expected to fail without the fix.

What do you think?

[auvipy]

it's better to use pyamqp as thats more maintained