Add test for 'ipfs config replace'

[Kubuxu]

No description provided.

[whyrusleeping]

whyd you remove this comment?

[whyrusleeping]

oh nvm, i see that you moved it up

[whyrusleeping]

Can you maybe break that test up a little bit? maybe into a setup step, the command execution, and the output check?

[whyrusleeping]

@Kubuxu any update here?

[Kubuxu]

How does it look now?

[whyrusleeping]

Much better, except you've angered the mighty travis CI.

[Kubuxu]

@whyrusleeping OSX/BSD sed is behaving quite strangely with -i flag and it looks like it will not support search and execute. Can I add gnu-sed as a requirement on OSX/BSD based systems?

//cc @chriscool

[chriscool]

@Kubuxu I think it is better to just avoid using the -i option when using sed.
You can instead redirect into new files for example like:

    sed -e /PrivKey/d -e s/10GB/11GB/ newconfig.orig.json >newconfig.step.json &&
    sed -e '"'"'/PeerID/ { s/,$// } '"'"' newconfig.step.json >newconfig.json

[chriscool]

It looks like there are still sed related problems:

expecting success: 

    cp "$IPFS_PATH/config" newconfig.json &&
    </dev/null sed -e /PrivKey/d -e s/10GB/11GB/ -i"~"  newconfig.json &&
    </dev/null sed -e '/PeerID/ { s/,$// } ' -i"~" newconfig.json

sed: 1: "/PeerID/ { s/,$// } 
": bad flag in substitute command: '}'
not ok 49 - setup for config replace test

[Kubuxu]

It works, Shanress on OSX passed, I will squash everything.

[whyrusleeping]

LGTM, thanks @Kubuxu and @chriscool :)