- Copy stable/10@296371 to releng/10.3 in preparation for 10.3-RC1
builds.
- Update newvers.sh to reflect RC1.
- Update __FreeBSD_version to reflect 10.3.
- Update default pkg(8) configuration to use the quarterly branch.

Approved by: re (implicit)

MFC r270027:

tmconfig compilation when MK_ATM == yes and MK_BSNMP == no

Makefile.inc1:
Always compile gensnmptree with bootstrap-tools when MK_BSNMP != no
instead of depending on a potentially stale tool installed on the build host

sbin/atm/atmconfig/Makefile:
- Always remove oid.h to avoid cluttering up the build/src tree.
- Consolidate all of the RESCUE/MK_BSNMP != no logic under one
conditional to improve readability
- Remove unnecessary ${.OBJDIR} prefixing for oid.h and use ${.TARGET} instead
of spelling out oid.h
- Add a missing DPADD for ${LIBCRYPTO} when compiled MK_BSNMP == yes and
MK_OPENSSL == yes and not compiling for /rescue/rescue

sbin/atm/atmconfig/main.c:
Change #ifndef RESCUE to #ifdef WITH_BSNMP in main.c to make it
clear that we're compiling bsnmp support into atmconfig

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Add missing static keywords for global variables to tools in sbin/.

These tools declare global variables without using the static keyword,
even though their use is limited to a single C-file, or without placing
an extern declaration of them in the proper header file.

Add support for the examination and modification of the devices.
This is implemented through SNMP and requires the ilmi daemon to
run on the system. To prevent bloat in rescue the atmconfig for
rescue is compiled without this stuff.

Allow more than one help file. There is a restriction that
each help file must start with a level 0 topic.

Get rid of a __DECONST by strdup'ing the string in question. When
called this way the program just prints its help intro, so the
memory leak is not a problem.

Pointed out by: bde

Add a program for configuration of the ATM drivers and the IP over ATM
stuff. This utility allows inspection of the ATM characteristics,
the PHY layer, including statistics of both, the retrival of the
list of currently open channels and also allows access to utopia(4).