Add network.sh to must_gather.sh

[hardys]

Otherwise MIRROR_IMAGES isn't defined when testing, and we see
a failure to pull the image in the CI logs when test ipv6

[hardys]

@stbenjam @trozet @danwinship

This fixes one problem with must-gather for the e2e-ipi-baremetal ipv6 CI, but it's still possible for the gather to get stuck if the serviceNetwork is completely broken, e.g:

[must-gather-rgdnc] POD Unable to connect to the server: dial tcp [fd02::1]:443: i/o timeout
[must-gather-rgdnc] POD Unable to connect to the server: dial tcp [fd02::1]:443: i/o timeout
[must-gather-rgdnc] POD Unable to connect to the server: dial tcp [fd02::1]:443: i/o timeout
[must-gather-rgdnc] POD Unable to connect to the server: dial tcp [fd02::1]:443: i/o timeout
[must-gather-rgdnc] POD Unable to connect to the server: dial tcp [fd02::1]:443: i/o timeout
[must-gather-rgdnc] POD Unable to connect to the server: dial tcp [fd02::1]:443: i/o timeout
[must-gather-rgdnc] POD Unable to connect to the server: dial tcp [fd02::1]:443: i/o timeout

Any suggestions on how we might handle that - should we fall back to scp and just copy the pod logs off each node perhaps?

[danwinship]

In general, must-gather depends on a minimal level of cluster functionality...

I'd say, if it turns out that "must-gather failed because the service network isn't up" turns out to be a recurring problem, then we should try to work around it, but it's OK to not worry about for now

[dcbw]

/lgtm

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[derekhiggins]

/lgtm

[derekhiggins]

/approved

[andfasano]

/lgtm

[stbenjam]

/approve

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