Update version of php5 packages
Update version of php5 packages

Version 4.17 has been removed from the Ubuntu repositories
Updating to 4.19
Factorization of versions for easier updates

Change-Id: I1493e8654ceccd6701a4a78d8eef6563079e2a0b

stackforge/fuel-plugin-external-zabbix,stackforge/fuel-plugin-external-zabbix,stackforge/fuel-plugin-external-zabbix,stackforge/fuel-plugin-external-zabbix