Updating get_tshark_version() to support multiple version strings
Updating get_tshark_version() to support multiple version strings

Vesrion strings for TSHARK is displayed differently on for different 
The following were found as a difference between Windows and Linux:

win_version_line = 'TShark 1.12.8 (v1.12.8-0-g5b6e543 from master-1.12)'
lnx_version_line = 'TShark (Wireshark) 2.0.0 (SVN Rev Unknown from unknown)'

The current implementation returned "(Wireshark)" in the Linux case, and caused an error in version comparision performed in 'get_tshark_display_filter_flag()'.
KimiNewt/pyshark