Update snmpd.conf.erb

Remove FQDN from snmpd.conf comments as it causes unnecessary reconfiguration when using a common image to launch many virtual machines.
let snmpd listen on ipv6
Allow IP Sources to be Set for Restricted access
Update CHANGELOG.md
Update README.md
one more typo
let loadavg be hash, then it would be extendable/overridable
do not only listen on localhost
Remove FQDN from snmpd.conf
Update contact info
Merge branch 'ipv6-listen'

of github.com:CBeerta/cookbook-snmp into CBeerta-ipv6-listen
Merge branch 'CBeerta-ipv6-listen'
Guard ipv6 with node.key?('ip6address')
Merge branch 'ip-restrict'

of github.com:CBeerta/cookbook-snmp into CBeerta-ip-restrict

Incorporate ip6address guard into merge

Conflicts:
	templates/default/snmpd.conf.erb
Merge branch 'CBeerta-ip-restrict'
Merge changelog typos

from github.com:glensc/chef-cookbook-snmp
Merge readme typos

from github.com:glensc/chef-cookbook-snmp
Change `load_average` to pure hash
v3.0.0

  @atomic-penguin
  * Update build files, and rubocopped.

  @jhmartin
  * removed fqdn fron template.

  @CBeerta
  * Added `sources` and `sources6` attributes.
  * Added ipv6 listener.

Breaking changes:

  @glensc
  * Change `load_average` from Array of Hashes, to Hash #27