fix freebsd service check

[b4ldr]

Hi,

Ill start by saying im not too familiar with your code base and will admit up front im not sure how to test the changes other then manully patching the file on my system and re running my my beacker tests.

The main issues is that the following check is returning false on FreeBSD 10.3, running in VirtualBOX via vagrant.

    describe service('openbgpd') do
      it { is_expected.to be_running }
    end

looking at the code and running it manually via irb suggests that there are unnecessary escape

irb(main):001:0> service = 'openbgpd'
=> "openbgpd"
irb(main):002:0> cmd = "service #{service} status | grep -E 'as \\(pid [0-9]+\\)'"
=> "service openbgpd status | grep -E 'as \\(pid [0-9]+\\)'"
irb(main):003:0> out = `#{cmd}`
=> ""
irb(main):004:0> $?
=> #<Process::Status: pid 2282 exit 1>
irb(main):005:0> cmd = "service #{service} status | grep -E 'as (pid [0-9]+)'"
=> "service openbgpd status | grep -E 'as (pid [0-9]+)'"
irb(main):006:0> out = `#{cmd}`
=> "openbgpd is running as pid 2028.\n"
irb(main):007:0> $?
=> #<Process::Status: pid 2288 exit 0>

hopefully this patch is useful but and happy to work on it more if you point me into the rigvht direction

Thanks

[b4ldr]

update: I have also added freebsd specific process commands. the main one that was failing is the Specinfra::Command::Base::Process.get() as freebsd ps does not support the -C switch. I suspect the others would have worked fine but thought i would update them to use pgrep as well

[mizzy]

LGTM. Thanks.

[mizzy]

Released as v2.71.2.