Fix Rubocop Performance/StringInclude offenses

Similar to the work in ed14bbd, this commit updates instances of !~ to
instead negate String#include?.

The Performance/StringInclude began identifying this pattern in
rubocop-performance 1.15.2.

Author: mhashizume

lib/puppet/type/host.rb

@@ -23,7 +23,7 @@ def valid_v6?(addr)
     end
 
     def valid_newline?(addr)
-      addr !~ %r{\n} && addr !~ %r{\r}
+      !addr.include?("\n") && !addr.include?("\r")
     end
 
     validate do |value|

spec/spec_helper_acceptance.rb

@@ -51,7 +51,7 @@
         on(host, '/usr/sbin/svcadm restart /system/ca-certificates')
         timeout = 60
         counter = 0
-        while on(host, 'svcs -x ca-certificates').output !~ %r{State: online}
+        until on(host, 'svcs -x ca-certificates').output.include?('State: online')
           raise 'ca-certificates services failed start up' if counter > timeout
           sleep 5
           counter += 5