Revert "detect VTY TELNET port connection failures in TTCN3 tests"

With this patch, I see all ttcn3-bsc-tests failing with
"Verdict: fail reason: VTY Timeout for prompt"

This reverts commit cb111b21aba1d5881da1a1d3f19754cbd15b3779.

Change-Id: I215d7ab5eee75cf6d3afaac760af64356c943140
8 files changed