tc: bash-completion: Add the _from variant to _tc_one* funcs

tc: bash-completion: Add the _from variant to _tc_one* funcs

The _tc_one_of_list and _tc_once_attr functions simplfy the bash
completion task by validating each attr exist only once on the command
line.

For example, for the command line:

$ a b c d e

and the call to _tc_once_attr with "a f g", the function will suggest
"f g" as "a" existed in the command line in args 0.

Add the _from variant to those functions, which allows having the command
line option once from a specified index. In the previous example, calling
_tc_once_attr with 4 and "a f g" will suggest "a f g".

Signed-off-by: Yotam Gigi <yotamg@mellanox.com>