eto os prepare (refat)

- Chroot now with logging
- mount umount msgs
- server download single
- access InstallCommand programmatically RIO-56
- adds scpFile to AbstractRioCommand RIO-57
- adds tar to AbstractRioCommand
- AsyncStdout, tar improvements
- log only if not at the end of the stream
- upgrade pom to 10-SNAPSHOT
Merge pull request #30 from objectos/rio_41_eto_os

RIO-41: Chroot now with logging