Make protocol version 2 the default protocol, and only run on version 1 if V1 is...

Make protocol version 2 the default protocol, and only run on version 1 if V1 is explcitly given as a module option.

I haven't received a single line of feedback on protocol v1
for at least 1 1/2 years, whereas protocol v2 has an active
userbase and more people developing around it.

This patch includes a manpage update, describing the new
version handling, as well as documenting the recent changes
making the module transfer the IP address of the client machine
as submitted with
464c69609aa7e582f484c1d357b7c6d3eb2bcbe3.

Bug #8148 (Default to protocol version 2 for SMB Traffic Analyzer in Samba
3.6.0).