travis-ci: Installing libhttp-daemon-ssl-perl to make plugins/tests/check_http.t possible to run

.travis.yml

@@ -8,7 +8,7 @@ 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 fping snmp netcat smbclient fping pure-ftpd apache2 postfix
+  - 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
 
 before_script: