Add ipfs version --all to report all version information at once

[chriscool]

To make it easier for people to report information about ipfs when describing a bug, it could be nice to have them type only one command instead of ipfs version --commit and ipfs version --repo.

We could also perhaps make it print the current OS and platform while at it and perhaps the go version used to compile the binary too (not sure if it is possible).

This is linked to PR #2786.

[chriscool]

By the way when using both --repo and --commit flags at the same time, only the repo version is reported:

$ ipfs version --commit --repo
3
$ ipfs version --repo --commit
3