Compile Erlang/OTP 21

OTP 21 deprecated erlang:get_stacktrace/0 in favor of a new
try/catch syntax. Unfortunately that's not realistic for projects
that support multiple Erlang versions (like us) until OTP 21 can be
the minimum version requirement. In order to compile we have to ignore
the warning. The broad compiler option seems to be the most common
way to support compilation on multiple OTP versions with warnings_as_errors.

[#157964874]

(cherry picked from commit e3b2830)

Author: michaelklishin

src/rabbit.erl

@@ -16,6 +16,10 @@
 
 -module(rabbit).
 
+%% Transitional step until we can require Erlang/OTP 21 and
+%% use the now recommended try/catch syntax for obtaining the stack trace.
+-compile(nowarn_deprecated_function).
+
 -behaviour(application).
 
 -export([start/0, boot/0, stop/0,

src/rabbit_channel.erl

@@ -16,6 +16,10 @@
 
 -module(rabbit_channel).
 
+%% Transitional step until we can require Erlang/OTP 21 and
+%% use the now recommended try/catch syntax for obtaining the stack trace.
+-compile(nowarn_deprecated_function).
+
 %% rabbit_channel processes represent an AMQP 0-9-1 channels.
 %%
 %% Connections parse protocol frames coming from clients and

src/rabbit_node_monitor.erl

@@ -16,6 +16,10 @@
 
 -module(rabbit_node_monitor).
 
+%% Transitional step until we can require Erlang/OTP 21 and
+%% use the now recommended try/catch syntax for obtaining the stack trace.
+-compile(nowarn_deprecated_function).
+
 -behaviour(gen_server).
 
 -export([start_link/0]).

src/rabbit_reader.erl

@@ -16,6 +16,10 @@
 
 -module(rabbit_reader).
 
+%% Transitional step until we can require Erlang/OTP 21 and
+%% use the now recommended try/catch syntax for obtaining the stack trace.
+-compile(nowarn_deprecated_function).
+
 %% This is an AMQP 0-9-1 connection implementation. If AMQP 1.0 plugin is enabled,
 %% this module passes control of incoming AMQP 1.0 connections to it.
 %%

src/rabbit_vhost_process.erl

@@ -30,6 +30,10 @@
 
 -module(rabbit_vhost_process).
 
+%% Transitional step until we can require Erlang/OTP 21 and
+%% use the now recommended try/catch syntax for obtaining the stack trace.
+-compile(nowarn_deprecated_function).
+
 -include("rabbit.hrl").
 
 -define(TICKTIME_RATIO, 4).