[binutils-gdb/gdb-8.0-branch] Python: Move and rename gdb.BtraceFunction

[sergiodj+buildbot@sergiodj.net]

*** TEST RESULTS FOR COMMIT 5b2f026c0dca5e25c98f2a8288365386ec5bdffc ***

Author: Tim Wiederhake <tim.wiederhake@intel.com>
Branch: gdb-8.0-branch
Commit: 5b2f026c0dca5e25c98f2a8288365386ec5bdffc

Python: Move and rename gdb.BtraceFunction

Remove gdb.BtraceFunctionCall and replace by gdb.FunctionSegment.  Additionally,
rename prev_segment and next_segment to prev and next.