New "make relive" similar to "ejabberdctl live" without installing

Prepare with:
  ./autogen.sh && ./configure --with-rebar=./rebar3 && make
Or use this if you installed Elixir:
  ./autogen.sh && ./configure --with-rebar=mix && make
Start without installing (it recompiles when necessary):
  make relive
It stores config, database and logs in _build/relive/
There's available the well-known script:
  _build/relive/ejabberdctl

Please note this fails immediately:
  r3:do(compile).
This crashes a few seconds later:
  rebar3:run(["compile"]).
Workaround that works correctly:
  ejabberd_admin:update().

rel/relive.config

@@ -0,0 +1,3 @@
+[{mnesia, [{dir, "_build/relive/database"}]},
+ {ejabberd, [{config, "_build/relive/conf/ejabberd.yml"},
+             {log_path, "_build/relive/logs/ejabberd.log"}]}].

rel/relive.escript

@@ -0,0 +1,26 @@
+#!/usr/bin/env escript
+
+main(_) ->
+    Base = "_build/relive",
+    prepare(Base, "", none),
+    prepare(Base, "conf", {os, cmd, "rel/setup-relive.sh"}),
+    prepare(Base, "database", none),
+    prepare(Base, "logs", none),
+    c:erlangrc([os:cmd("echo -n $HOME")]),
+    ok.
+
+prepare(BaseDir, SuffixDir, MFA) ->
+    Dir = filename:join(BaseDir, SuffixDir),
+    case file:make_dir(Dir) of
+        ok ->
+            io:format("Preparing relive dir ~s...~n", [Dir]),
+            case MFA of
+                none -> ok;
+                {M, F, A} -> M:F(A)
+            end;
+        {error, eexist} ->
+            ok;
+        {error, LogsError} ->
+            io:format("Error creating dir ~s: ~p~n", [Dir, LogsError]),
+            halt(1)
+    end.

rel/setup-relive.sh

@@ -0,0 +1,30 @@
+PWD_DIR=`pwd`
+REL_DIR=$PWD_DIR/_build/relive/
+CON_DIR=$REL_DIR/conf/
+
+[ -z "$REL_DIR_TEMP" ] && REL_DIR_TEMP=$REL_DIR
+CON_DIR_TEMP=$REL_DIR_TEMP/conf/
+
+make ejabberdctl.relive
+chmod +x ejabberdctl.relive
+mv ejabberdctl.relive $REL_DIR/ejabberdctl
+
+cp inetrc $CON_DIR/
+cp ejabberdctl.cfg.example $CON_DIR/ejabberdctl.cfg.example
+cp ejabberd.yml.example $CON_DIR/ejabberd.yml.example
+cp test/ejabberd_SUITE_data/ca.pem $CON_DIR
+cp test/ejabberd_SUITE_data/cert.pem $CON_DIR
+
+cd $CON_DIR_TEMP
+
+sed -i "s|# certfiles:|certfiles:\n  - $CON_DIR/cert.pem|g" ejabberd.yml.example
+sed -i "s|certfiles:|ca_file: $CON_DIR/ca.pem\ncertfiles:|g" ejabberd.yml.example
+sed -i 's|^acl:$|acl:\n  admin: [user: admin]|g' ejabberd.yml.example
+[ ! -f "$CON_DIR/ejabberd.yml" ] \
+    && echo -n "ejabberd.yml " \
+    && mv ejabberd.yml.example ejabberd.yml
+
+sed -i "s|#' POLL|EJABBERD_BYPASS_WARNINGS=true\n\n#' POLL|g" ejabberdctl.cfg.example
+[ ! -f "$CON_DIR/ejabberdctl.cfg" ] \
+    && echo -n "ejabberdctl.cfg " \
+    && mv ejabberdctl.cfg.example ejabberdctl.cfg