orchestra: add remote.sh commands analogous to misc.sh

orchestra: add remote.sh commands analogous to misc.sh

Adds a remote.sh similar to misc.sh, in fact a shortcut for remote.run,
but return output instead of proc
Example:
    my_name = Remote('127.0.0.1').sh('whoami')

Adds a remote.sh_file run a script as file on a remote with or without sudo
Example 1: Run python script
    Remote('127.0.0.1').sh_file("#!/usr/bin/env python3\n"
                                "import sys\n"
                                "print(sys.version_info)")
Example 2: Run script as root
    Remote('user@host.domain').sh_file("whoami", sudo=True,
                                       label="who-am-i-for-the-real")
Example 3: Run script as other user
    Remote('user@host.domain').sh_file("whoami", sudo='nobody', )

Signed-off-by: Kyr Shatskyy <kyrylo.shatskyy@suse.de>