- 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 294548-294549,294556,294684: Add watch scripts

r294548: Add scripts for watching common entry points.
r294549: Fix bad title on script (caused by copy/paste).
r294556: fbt -> syscall; fbt names changed to be sys_*
r294684: Bump copyright for change from fbt to syscall

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

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

Add a new script, hotopen, which shows what uid is opening files
on a per second basis. While here clean up the Makefile as well.

MFC after: 1 week

Add support for our own DTrace scripts and those from the DTraceToolkit
to the build system. FreeBSD written scripts are stored in
src/share and the toolkit scripts are brought from the cddl directory
into a working tree via install.

MFC after: 2 weeks