Doc and Config fixups.

Be explicit about linux package names for those not familiar with
the platform. Also more explicit about steps such as editing file,
and testing the daemon.

Remove leading whitespace from commented-out config examples.
Set default parallel DNS back to 10, and suggest override of 100 in
config file. Enforce skipped DNS for autoconf IPs if unset (this is
a consequence of the way Dancer merges the two files - top level
config cannot be in both files).

Netdisco/lib/App/Netdisco.pm

@@ -79,6 +79,9 @@ setting('plugins')->{DBIC}->{daemon} = {
     schema_class => 'App::Netdisco::Daemon::DB',
 };
 
+# force skipped DNS resolution, if unset
+setting('dns')->{no} ||= ['fe80::/64','169.254.0.0/16']
+
 =head1 NAME
 
 App::Netdisco - An open source web-based network management tool.
@@ -134,15 +137,15 @@ Notes|App::Netdisco::Manual::ReleaseNotes>.
 
 Netdisco has several Perl library dependencies which will be automatically
 installed. However it's I<strongly> recommended that you first install
-L<DBD::Pg> and L<SNMP> using your operating system packages. The following
-commands will test for the existence of them on your system:
+L<DBD::Pg>, L<SNMP>, and a compiler using your operating system packages.
 
- perl -MDBD::Pg\ 999
- perl -MSNMP\ 999
+On Ubuntu/Debian:
 
-You'll also need a compiler for some of the other Perl dependencies. For
-example on Ubuntu/Debian, install the C<build-essential> package. On
-Fedora/Red-Hat, install C<make>, C<automake>, and C<gcc>.
+ root:~# apt-get install libdbd-pg-perl libsnmp-perl build-essential
+
+On Fedora/Red-Hat:
+
+ root:~# yum install perl-DBD-Pg net-snmp-perl make automake gcc
 
 With those installed, we can proceed...
 
@@ -187,7 +190,8 @@ Link some of the newly installed apps into a handy location:
  ln -s ~/perl5/bin/{localenv,netdisco-*} ~/bin/
 
 Test the installation by running the following command, which should only
-produce a status message (and throw up no errors):
+produce a status message (it's just a test - you'll start the daemon properly,
+later on):
 
  ~/bin/netdisco-daemon status
 
@@ -200,12 +204,13 @@ template from this distribution:
  cp ~/perl5/lib/perl5/auto/share/dist/App-Netdisco/environments/deployment.yml ~/environments
  chmod +w ~/environments/deployment.yml
 
-Edit the file and change the database connection parameters to match those for
-your local system (that is, the C<name>, C<host>, C<user> and C<pass>).
+Edit the file ("C<~/environments/deployment.yml>") and change the database
+connection parameters to match those for your local system (that is, the
+C<name>, C<host>, C<user> and C<pass>).
 
 In the same file uncomment and edit the C<domain_suffix> setting to be
-appropriate for your local site. Optionally, set the C<no_auth> value to true
-if you wish to skip user authentication in the web interface.
+appropriate for your local site. If this is a fresh install, uncomment and set
+the C<no_auth> value to true (temporarily disables user authentication).
 
 =head1 Bootstrap
 

Netdisco/share/config.yml

@@ -162,8 +162,8 @@ workers:
   sleep_time: 2
 
 dns:
-  max_outstanding: 250
   no: ['fe80::/64','169.254.0.0/16']
+  max_outstanding: 10
 
 #housekeeping:
 #  discoverall:

Netdisco/share/environments/deployment.yml

@@ -20,21 +20,21 @@ database:
 
 # will be stripped from fqdn when displayed in the web UI
 # also, do not forget the leading dot.
-#  domain_suffix: '.example.com'
+# ```````````````````````````````````````````````````````
+#domain_suffix: '.example.com'
 
-# uncomment and set to true to disable authentication/login.
-#  no_auth: false
+# uncomment and set to true to disable authentication/login
+# `````````````````````````````````````````````````````````
+#no_auth: false
 
-# community: ['public']
-# community_rw: ['private']
+# SNMP community string(s)
+# ````````````````````````
+#community: ['public']
+#community_rw: ['private']
 
-# when not set, Netdisco loads all MIBs in mibhome directory.
-#  mibdirs:
-#    - cisco
-#    - rfc
-#    - net-snmp
-
-# housekeeping:
+# daemon will keep netdisco up to date on this schedule
+# `````````````````````````````````````````````````````
+#housekeeping:
 #  discoverall:
 #    when: '5 7 * * *'
 #  macwalk:
@@ -48,6 +48,8 @@ database:
 #  expiry:
 #    when: '20 23 * * *'
 
-# expire_devices: 60
-# expire_nodes: 90
-# expire_nodes_archive: 60
+# increase the performance of parallel DNS resolution for node names
+# (the default is max_outstanding: 10)
+#dns:
+#  max_outstanding: 100
+