MFC r291770: rc.subr: Check for running daemons before a custom start_cmd
is executed.

Currently rc scripts implementing their own start_cmd do not enjoy the
benefits of rc.subr's own check for rc_pid.

This leads to around a third of ports with such a start_cmd not to check for
the process at all and two thirds of ports to re-implement this check
(sometimes wrongly).

This patch moves the check for rc_pid to before ${rc_arg}_cmd is executed.

Submitted by: Dirk Engling
Reviewed by: feld
Relnotes: yes

MFC r286163: rc.subr: Allow rc.conf.d with multi-directory local_startup.

I also changed ${...%*/rc.d} to ${...%/rc.d} since the shortest match always
has an empty string for the asterisk.

PR: 201641
Submitted by: Jamie Landeg-Jones (original version)

MFH (r275359, r290007): make load_rc_config's name argument optional

MFC r272974,272976:

Add ${name}_env and ${name}_prepend. ${name}_env is an argument list which
will be passed to env(1). ${name}_prepend is simply prepended to the command
line for $command.

MFC r272393:

Resurrect set_rcvar() as a function to define a rc.conf variable.
It defines a variable and its default value in load_rc_config() just after
rc.conf is loaded. "rcvar" command shows the current and the default values.

MFC r271545, 271610:
Make net.inet.ip.sourceroute, net.inet.ip.accept_sourceroute, and
net.inet.ip.process_options vnet-aware.

MFH (r270392, r270676, r270679, r270698): add support for subdirectories in rc.conf.d

Approved by: re (glebius)

MFC r264243:

Loosen the processing of *_IF_aliasN vars to be less strict. Previously,
the first alias had to be _alias0 and processing stopped at the first non-
defined variable (preventing gaps). Allowing gaps gives the administrator
the ability to group aliases in an adhoc manner and also lifts the
requirement to renumber aliases simply to comment-out an existing one.
Aliases are processed in numerical ascending order.

NB: Also Patches mdconfig{,2} rc(8) boot scripts to loosen the numbering
scheme for mdconfig_mdN settings to be less strict in the same manner.

Discussed on: -rc

MFC r272974,272976:

Add ${name}_env and ${name}_prepend. ${name}_env is an argument list which
will be passed to env(1). ${name}_prepend is simply prepended to the command
line for $command.

MFC r272393:

Resurrect set_rcvar() as a function to define a rc.conf variable.
It defines a variable and its default value in load_rc_config() just after
rc.conf is loaded. "rcvar" command shows the current and the default values.

MFC r271545, 271610:
Make net.inet.ip.sourceroute, net.inet.ip.accept_sourceroute, and
net.inet.ip.process_options vnet-aware.

MFH (r270392, r270676, r270679, r270698): add support for subdirectories in rc.conf.d

Approved by: re (glebius)

MFC r264243:

Loosen the processing of *_IF_aliasN vars to be less strict. Previously,
the first alias had to be _alias0 and processing stopped at the first non-
defined variable (preventing gaps). Allowing gaps gives the administrator
the ability to group aliases in an adhoc manner and also lifts the
requirement to renumber aliases simply to comment-out an existing one.
Aliases are processed in numerical ascending order.

NB: Also Patches mdconfig{,2} rc(8) boot scripts to loosen the numbering
scheme for mdconfig_mdN settings to be less strict in the same manner.

Discussed on: -rc