debian 8 support

[rndmh3ro]

I implemented Debian 8 support (and removed debian 6 support, since its EOL) as well as making it easier to locally test the role with inspec.

[conorsch]

There are a few sysctl values that aren't explicitly defined in the role, yet are tested for. At least under Debian, the assumption causes tests to fail:

Finished in 2.51 seconds (files took 6 minutes 41 seconds to load)
99 examples, 18 failures

Failed examples:

rspec  # Kernel Parameter net.ipv4.conf.default.accept_source_route value should eq 0
rspec  # Kernel Parameter net.ipv4.conf.default.accept_redirects value should eq 0
rspec  # Kernel Parameter net.ipv4.conf.all.accept_redirects value should eq 0
rspec  # Kernel Parameter net.ipv4.conf.all.secure_redirects value should eq 0
rspec  # Kernel Parameter net.ipv4.conf.default.secure_redirects value should eq 0
rspec  # Kernel Parameter net.ipv4.conf.all.send_redirects value should eq 0
rspec  # Kernel Parameter net.ipv4.conf.all.send_redirects value should eq 0
rspec  # Kernel Parameter net.ipv4.conf.all.log_martians value should eq 1
rspec  # Kernel Parameter net.ipv6.conf.default.accept_redirects value should eq 0
rspec  # Kernel Parameter net.ipv6.conf.all.accept_redirects value should eq 0
rspec  # Kernel Parameter net.ipv6.conf.default.router_solicitations value should eq 0
rspec  # Kernel Parameter net.ipv6.conf.default.accept_ra_rtr_pref value should eq 0
rspec  # Kernel Parameter net.ipv6.conf.default.accept_ra_pinfo value should eq 0
rspec  # Kernel Parameter net.ipv6.conf.default.accept_ra_defrtr value should eq 0
rspec  # Kernel Parameter net.ipv6.conf.default.autoconf value should eq 0
rspec  # Kernel Parameter net.ipv6.conf.default.dad_transmits value should eq 0
rspec  # Kernel Parameter net.ipv6.conf.default.max_addresses value should eq 1
rspec  # Kernel Parameter kernel.sysrq value should eq 0

>>>>>> Verify failed on instance <os-ansible-latest-debian-8>.
>>>>>> Please see .kitchen/logs/os-ansible-latest-debian-8.log for more details
>>>>>> ------Exception-------
>>>>>> Class: Kitchen::ActionFailed
>>>>>> Message: Inspec Runner returns 1

The inspec profiles do load correctly, however, which is grand. Since this PR only modifies the testing setup, +1 for merge. We can continue to debug the test suite for all platforms going forward, and we don't need to worry about config regressions from merging these test-only changes.

[rndmh3ro]

Yes, these are right now to be expected and have nothing to do with Debian itself.
I will fix them later.

[conorsch]

👍