add perl snmp to travis dependencies

it is required for the check_snmp tests

Signed-off-by: Sven Nierlein <Sven.Nierlein@consol.de>

.travis.yml

@@ -9,7 +9,7 @@ before_install:
 
 install:
   - sudo apt-get install -qq --no-install-recommends perl autotools-dev libdbi-dev libldap2-dev libpq-dev libmysqlclient-dev libfreeradius-client-dev libkrb5-dev libnet-snmp-perl procps
-  - sudo apt-get install -qq --no-install-recommends libdbi0-dev libdbd-sqlite3 libssl-dev dnsutils snmp-mibs-downloader
+  - sudo apt-get install -qq --no-install-recommends libdbi0-dev libdbd-sqlite3 libssl-dev dnsutils snmp-mibs-downloader libsnmp-perl
   - sudo apt-get install -qq --no-install-recommends fping snmp netcat smbclient fping pure-ftpd apache2 postfix libhttp-daemon-ssl-perl
   - sudo apt-get install -qq --no-install-recommends autoconf automake