Automatically maintain the whatis database

[citrus-it]

Fixes #494

Packages now get their man pages tagged with a restart_fmri action:

% pkg contents -mg packages/i386/nightly-nd/repo.redist fss | grep man
dir group=bin mode=0755 owner=root path=usr/share/man
dir facet.doc.man=true group=bin mode=0755 owner=root path=usr/share/man/man7
file feda492d099cc87d4674fbbb3e859ef2af35fb3d chash=4dcc635a03b98b051a1243be45771d2327910cf2 facet.doc.man=true group=bin mode=0444 owner=root path=usr/share/man/man7/FSS.7 pkg.content-hash=file:sha512t_256:4284e5c4e44a8b7692b147780a9c0c36c3a20569e8f8e33c23e39b01af380329 pkg.content-hash=gzip:sha512t_256:d4d943badc489cf3d1981f377027bff7ce16c0b227b311261cb0b2b346887f4a pkg.csize=3293 pkg.size=8128 restart_fmri=svc:/system/rebuild-whatis:default

Installing a new package which delivers a man page causes a database rebuild, and apropos works for the new page:

bloody% apropos pppd
bloody% tail -f `svcs -L rebuild-whatis` &
[1] 671
bloody% [ Jun 12 13:14:15 Enabled. ]
[ Jun 12 13:14:17 Executing start method ("/usr/bin/man -w"). ]
man: /usr/share/man/man3ssl/bio.3: No such file or directory
[ Jun 12 13:14:31 Method "start" exited with status 0. ]

bloody%
bloody% pfexec pkg install ppp
           Packages to install:  1
            Services to change:  1
       Create boot environment: No
Create backup boot environment: No

Planning linked: 0/1 done; 1 working: zone:test
Linked image 'zone:test' output:
|
`
Planning linked: 1/1 done
DOWNLOAD                                PKGS         FILES    XFER (MB)   SPEED
Completed                                1/1         25/25      0.3/0.3      --

Downloading linked: 0/1 done; 1 working: zone:test
Downloading linked: 1/1 done
PHASE                                          ITEMS
Installing new actions                         66/66
Updating package state database                 Done
Updating package cache                           0/0
Updating image state                            Done
[ Jun 12 13:15:00 Stopping because service restarting. ]
[ Jun 12 13:15:00 Executing stop method (null). ]
[ Jun 12 13:15:00 Executing start method ("/usr/bin/man -w"). ]
man: /usr/share/man/man3ssl/bio.3: No such file or directory
[ Jun 12 13:15:00 Method "start" exited with status 0. ]
Creating fast lookup database                   Done
Reading search index                            Done
Updating search index                            1/1
Executing linked: 0/1 done; 1 working: zone:test
Executing linked: 1/1 done

bloody% apropos pppd
pppd(1m)                 - point to point protocol daemon