Daemon Spawning throws error with the new multiaddr version

[vasco-santos]

js-ipfs-api tests are broken using multiaddr@5.0.0, when spawning the daemon.

Basically, the gateway address generated by js-ipfsd-ctl has an additional space at the beginning of the string. As a result, an exception is thrown, as implemented in https://github.com/multiformats/js-multiaddr/blob/master/src/index.js#L41.

Uncaught Error: multiaddr " /ip4/127.0.0.1/tcp/49586" must start with a "/"

[vasco-santos]

I will open a PR for solving this issue