MFC r309676

MFC r309676

Export the whole thread name in kinfo_proc

kinfo_proc::ki_tdname is three characters shorter than
thread::td_name.  Add a ki_moretdname field for these three
extra characters.  Add the new field to kinfo_proc32, as well.
Update all in-tree consumers to read the new field and assemble
the full name, except for lldb's HostThreadFreeBSD.cpp, which
I will handle separately.  Bump __FreeBSD_version.

Sponsored by:	Dell EMC

git-svn-id: svn://svn.freebsd.org/base/stable/10@310121 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f