core: Cleanup gerrit and JIRA references. (#40)

* Remove .gitreview and switch to pulling the main asterisk branch
  version from configure.ac instead.

* Replace references to JIRA with GitHub.

* Other minor cleanup found along the way.

Resolves: #39
(cherry picked from commit 6f218514fb)

configure

@@ -1,8 +1,8 @@
 #! /bin/sh
 # Guess values for system-dependent variables and create Makefiles.
-# Generated by GNU Autoconf 2.69 for asterisk trunk.
+# Generated by GNU Autoconf 2.69 for asterisk 18.
 #
-# Report bugs to <https://issues.asterisk.org>.
+# Report bugs to <https://github.com/asterisk/asterisk/issues>.
 #
 #
 # Copyright (C) 1992-1996, 1998-2012 Free Software Foundation, Inc.
@@ -269,8 +269,8 @@ fi
     $as_echo "$0: be upgraded to zsh 4.3.4 or later."
   else
     $as_echo "$0: Please tell bug-autoconf@gnu.org and
-$0: https://issues.asterisk.org about your system,
-$0: including any error possibly output before this
+$0: https://github.com/asterisk/asterisk/issues about your
+$0: system, including any error possibly output before this
 $0: message. Then install a modern shell, or manually run
 $0: the script under such a shell if you do have one."
   fi
@@ -582,9 +582,9 @@ MAKEFLAGS=
 # Identity of this package.
 PACKAGE_NAME='asterisk'
 PACKAGE_TARNAME='asterisk'
-PACKAGE_VERSION='trunk'
-PACKAGE_STRING='asterisk trunk'
-PACKAGE_BUGREPORT='https://issues.asterisk.org'
+PACKAGE_VERSION='18'
+PACKAGE_STRING='asterisk 18'
+PACKAGE_BUGREPORT='https://github.com/asterisk/asterisk/issues'
 PACKAGE_URL=''
 
 ac_unique_file="main/asterisk.c"
@@ -2070,7 +2070,7 @@ if test "$ac_init_help" = "long"; then
   # Omit some internal or obsolete options to make the list less imposing.
   # This message is too long to be a string in the A/UX 3.1 sh.
   cat <<_ACEOF
-\`configure' configures asterisk trunk to adapt to many kinds of systems.
+\`configure' configures asterisk 18 to adapt to many kinds of systems.
 
 Usage: $0 [OPTION]... [VAR=VALUE]...
 
@@ -2136,7 +2136,7 @@ fi
 
 if test -n "$ac_init_help"; then
   case $ac_init_help in
-     short | recursive ) echo "Configuration of asterisk trunk:";;
+     short | recursive ) echo "Configuration of asterisk 18:";;
    esac
   cat <<\_ACEOF
 
@@ -2322,7 +2322,7 @@ Some influential environment variables:
 Use these variables to override the choices made by `configure' or to help
 it to find libraries and programs with nonstandard names/locations.
 
-Report bugs to <https://issues.asterisk.org>.
+Report bugs to <https://github.com/asterisk/asterisk/issues>.
 _ACEOF
 ac_status=$?
 fi
@@ -2385,7 +2385,7 @@ fi
 test -n "$ac_init_help" && exit $ac_status
 if $ac_init_version; then
   cat <<\_ACEOF
-asterisk configure trunk
+asterisk configure 18
 generated by GNU Autoconf 2.69
 
 Copyright (C) 2012 Free Software Foundation, Inc.
@@ -2546,9 +2546,9 @@ $as_echo "$as_me: WARNING: $2: see the Autoconf documentation" >&2;}
 $as_echo "$as_me: WARNING: $2:     section \"Present But Cannot Be Compiled\"" >&2;}
     { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: $2: proceeding with the compiler's result" >&5
 $as_echo "$as_me: WARNING: $2: proceeding with the compiler's result" >&2;}
-( $as_echo "## ------------------------------------------ ##
-## Report this to https://issues.asterisk.org ##
-## ------------------------------------------ ##"
+( $as_echo "## ---------------------------------------------------------- ##
+## Report this to https://github.com/asterisk/asterisk/issues ##
+## ---------------------------------------------------------- ##"
      ) | sed "s/^/$as_me: WARNING:     /" >&2
     ;;
 esac
@@ -3217,7 +3217,7 @@ cat >config.log <<_ACEOF
 This file contains any messages produced by compilers while
 running configure, to aid debugging if configure makes a mistake.
 
-It was created by asterisk $as_me trunk, which was
+It was created by asterisk $as_me 18, which was
 generated by GNU Autoconf 2.69.  Invocation command line was
 
   $ $0 $@
@@ -36237,7 +36237,7 @@ cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
 # report actual input values of CONFIG_FILES etc. instead of their
 # values after options handling.
 ac_log="
-This file was extended by asterisk $as_me trunk, which was
+This file was extended by asterisk $as_me 18, which was
 generated by GNU Autoconf 2.69.  Invocation command line was
 
   CONFIG_FILES    = $CONFIG_FILES
@@ -36293,13 +36293,13 @@ $config_files
 Configuration headers:
 $config_headers
 
-Report bugs to <https://issues.asterisk.org>."
+Report bugs to <https://github.com/asterisk/asterisk/issues>."
 
 _ACEOF
 cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
 ac_cs_config="`$as_echo "$ac_configure_args" | sed 's/^ //; s/[\\""\`\$]/\\\\&/g'`"
 ac_cs_version="\\
-asterisk config.status trunk
+asterisk config.status 18
 configured by $0, generated by GNU Autoconf 2.69,
   with options \\"\$ac_cs_config\\"