Remove dftest man page

DFTest is a private test utility and isn't installed anywhere.

I don't think it makes sense to maintain a man page. Certainly
doesn't make sense to ship it.

The doc file is understandably minimal so just nuke it.

CMakeLists.txt

@@ -1958,7 +1958,6 @@ if (ASCIIDOCTOR_FOUND)
 		${CMAKE_BINARY_DIR}/doc/capinfos.html
 		${CMAKE_BINARY_DIR}/doc/captype.html
 		${CMAKE_BINARY_DIR}/doc/ciscodump.html
-		${CMAKE_BINARY_DIR}/doc/dftest.html
 		${CMAKE_BINARY_DIR}/doc/dumpcap.html
 		${CMAKE_BINARY_DIR}/doc/editcap.html
 		${CMAKE_BINARY_DIR}/doc/extcap.html

doc/CMakeLists.txt

@@ -47,7 +47,6 @@ ADD_MAN_PAGE(androiddump 1)
 ADD_MAN_PAGE(capinfos    1)
 ADD_MAN_PAGE(captype     1)
 ADD_MAN_PAGE(ciscodump   1)
-ADD_MAN_PAGE(dftest      1)
 ADD_MAN_PAGE(dumpcap     1)
 ADD_MAN_PAGE(editcap     1)
 ADD_MAN_PAGE(mergecap    1)

doc/dftest.adoc

@@ -1,57 +0,0 @@
-include::../docbook/attributes.adoc[]
-= dftest(1)
-:doctype: manpage
-:stylesheet: ws.css
-:linkcss:
-:copycss: ../docbook/{stylesheet}
-
-== NAME
-
-dftest - Shows display filter byte-code, for debugging dfilter routines.
-
-== SYNOPSIS
-
-[manarg]
-*dftest*
-[ <filter> ]
-
-== DESCRIPTION
-
-*dftest* is a simple tool which compiles a display filter and shows its bytecode.
-Please refer to doc/README.display_filter for a description of the
-DFVM (Display Filter Virtual Machine) Byte Codes.
-
-== OPTIONS
-
-filter::
-+
---
-The display filter expression. If needed it has to be quoted.
---
-
-include::diagnostic-options.adoc[]
-
-== EXAMPLES
-
-Show how the IP protocol is filtered:
-
-    dftest ip
-
-Shows how frame 150 is filtered:
-
-    dftest "frame.number == 150"
-
-== SEE ALSO
-
-xref:wireshark-filter.html[wireshark-filter](4)
-
-// 526a2946 - dftest and randpkt ... they are not documented in any man page.
-== AUTHORS
-
-.Original Author
-[%hardbreaks]
-Jan Šafránek
-
-.Contributors
-[%hardbreaks]
-Jaap Keuter