Shell: Updated CRaSH to 1.3.0-beta8

This update brings a few important fixes and features:

1. Better handling for ^C interrupts (by Tomasz)
2. Fix a PermGen leak by how Groovy was used, it shows its ugly head only
   when used in standalone CRaSH, which is how we use it in OSv.
3. Added SSH subsystem plugin, which enables to add Sftp support as a plugin.

This patch:
1. Updates the dependency references of CRaSH to 1.3.0-beta8, there are also
   group and package name changes.
2. Removes our imported crash ssh plugin code. It was needed because there was
   no way to add Sftp support in version 1.2.x without changing the source.

Signed-off-by: Or Cohen <orc@fewbytes.com>
SSH: Add SCP support (SCPCommandPlugin)

Signed-off-by: Or Cohen <orc@fewbytes.com>
SSH: Add Sftp support (SftpSubsystemPlugin)

Signed-off-by: Or Cohen <orc@fewbytes.com>