Add an option to raise on failure

* When the max attempt of max_failures is reached, we usually do nothing
  and move on
* We might want to fail the run instead of waiting forever or ignore the
  failure

Change-Id: I32719795edb5fbbd081442f54419ff3450e8c5f8

libraries/primitive_consul_lock.rb

@@ -18,6 +18,7 @@ def initialize(options = {})
       raise ArgumentError, "You can't set both concurrency and service" if @options[:concurrency] && @options[:service]
 
       @options[:backoff] ||= 5 # seconds
+      @options[:raise_on_failure] = false
 
       ConsulCommon.setup_consul(@options)
 
@@ -86,6 +87,7 @@ def wait_until(action, opts = {})
         Chef::Log.info "#{action.to_s.capitalize}ed the lock #{path}"
       else
         Chef::Log.warn "Will ignore errors and since we've reached #{opts[:max_failures]} errors"
+        raise "Max attempt #{opts[:max_failures]} reached and asked to raise" if opts[:raise_on_failure]
       end
     end