Adds a python based SNMP Trap Receiver which outputs received
SNMP Traps by UDP onyl at the moment. Can be extended later.
Tests results are verified by content_check.
The tests have to be enabed with ./configure --enable-snmp-tests
Test sndrcv_omsnmpv1_udp_dynsource.sh checks the new snmpv1dynsource
option.
In order to work, the following python packages needs to be installed:
pip install pysnmp
On Ubuntu 18, we need these packages to be installed:
apt install snmp libsnmp-dev snmp-mibs-downloader
closes: https://github.com/rsyslog/rsyslog/issues/3985
