[virsh plugin] take network scripts backup only if they exists

Start in the virsh plugin at the Ansible task named “backup interface network configuration” and inspect how network-script paths are gathered from the topology. Run the infrared virsh workflow with multiple interfaces and Linux bridges; it is done when absent interface configuration files are skipped instead of causing the command to fail.

Below ansible task is failing when running infrared virsh command to create VMs with multiple interfaces using linux bridges.

TASK [backup interface network configuration] *******************************************************************************************************************************
fatal: [hypervisor-0]: FAILED! => {"changed": false, "msg": "Source /etc/sysconfig/network-scripts/ifcfg-enp94s0f3 not found"}
fatal: [hypervisor-1]: FAILED! => {"changed": false, "msg": "Source /etc/sysconfig/network-scripts/ifcfg-enp94s0f3 not found"}

--topology-network configuration file which I am using is https://gist.github.com/venkataanil/f5a2a30ececc4a93d03aebe20fa52439

[root@f05-h10-000-1029p ~]# ls /etc/sysconfig/network-scripts/
ifcfg-eno1 ifdown-bnep ifdown-ipv6 ifdown-routes ifdown-tunnel ifup-eth ifup-isdn ifup-ppp ifup-TeamPort network-functions
ifcfg-eno2 ifdown-eth ifdown-isdn ifdown-sit ifup ifup-ib ifup-plip ifup-routes ifup-tunnel network-functions-ipv6
ifcfg-lo ifdown-ib ifdown-post ifdown-Team ifup-aliases ifup-ippp ifup-plusb ifup-sit ifup-wireless
ifdown ifdown-ippp ifdown-ppp ifdown-TeamPort ifup-bnep ifup-ipv6 ifup-post ifup-Team init.ipv6-global

[root@f05-h10-000-1029p ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
2: eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether 0c:c4:7a:fa:18:c2 brd ff:ff:ff:ff:ff:ff
inet 10.1.41.51/23 brd 10.1.41.255 scope global noprefixroute dynamic eno1
valid_lft 256932sec preferred_lft 256932sec
3: eno2: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000
link/ether 0c:c4:7a:fa:18:c3 brd ff:ff:ff:ff:ff:ff
4: enp94s0f0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether ac:1f:6b:2d:1b:24 brd ff:ff:ff:ff:ff:ff
5: enp94s0f1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether ac:1f:6b:2d:1b:25 brd ff:ff:ff:ff:ff:ff
6: enp94s0f2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether ac:1f:6b:2d:1b:26 brd ff:ff:ff:ff:ff:ff
7: enp94s0f3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether ac:1f:6b:2d:1b:27 brd ff:ff:ff:ff:ff:ff
12: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000
link/ether 52:54:00:27:ff:69 brd ff:ff:ff:ff:ff:ff
inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
valid_lft forever preferred_lft forever
13: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast master virbr0 state DOWN group default qlen 1000
link/ether 52:54:00:27:ff:69 brd ff:ff:ff:ff:ff:ff