Fix Eltex.LTP.get_version script

Merged Dmitry Lukhtionov requested to merge eltex_ltp_get_version into master

Парсит такой вывод (при включенном дебаге на железке)

Jun 15 20:23:05 Myndybash_LTP-1 clish: <cmd_tacacs_auth> argv[4] = cmd=show
Jun 15 20:23:05 Myndybash_LTP-1 clish: <cmd_tacacs_auth> argv[5] = cmd-arg="version"
Eltex LTP-8X:rev.C software version 3.30.0 build 2931 on 28.11.2017 16:48

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