fix pear dependencies

Ryan Richard

2015-01-09 b45f9af9334046b65b44b454cfd997e01f35a642

fix pear dependencies

* net_smtp2 to net_smtp
* auth_sasl2-beta to auth_sasl

Currently installing `Net_SMTP2` results with the following error:

```bash
[09-Jan-2015 21:15:14 UTC] PHP Fatal error:  Class 'Net_SMTP' not found in /var/www/program/lib/Roundcube/rcube_smtp.php on line 111
```

Switching back to Net_SMTP fixes this issue

 Dockerfile

@@ -20,7 +20,7 @@
RUN a2enmod ssl

RUN apt-get install -qq php5 php-pear php5-mysql php5-pgsql php5-sqlite
RUN pear install mail_mime mail_mimedecode net_smtp2-beta net_idna2-beta auth_sasl2-beta net_sieve crypt_gpg
RUN pear install mail_mime mail_mimedecode net_smtp net_idna2-beta auth_sasl net_sieve crypt_gpg

RUN rm -rf /var/www
ADD . /var/www