update genicam template names and cope with missing camera with auto-gen

[gilesknap]

Some minor improvements to make genicam more robust:

• for auto-gen Class of camera, make the pvi device ID 'auto-' with camera ID as the suffix
  • because the old approach created illegal device names when ID was ip address
• cope with arv-tool failing to connect to the camera in start.sh
• update the 'CLASS' enum in ADAravis.ibek.support.yaml to match the set of templates in the most recent ADGenicam
  • and update the pvi entry to match the new ID scheme above

[gilesknap]

@marcelldls I have also cheesed handling of the problem that CI fails with aravias autogen pvi-device.

It's a pretty benign cheese:
https://github.com/epics-containers/p47-services/blob/d01eef12b3c34b3f7fc79dec56503254ec94bce3/.github/workflows/ci_verify.sh#L64-L65

[marcelldls]

Nice one! LGMT. Are we happy with the silent fail?

[gilesknap]

Weeeeeeell I'd like to say

echo can't connect to camera
exit 1

But for those that choose the path of >1 camera per IOC this would be bad.

So shall we pop in a

echo can't connect to camera ${instance_id}

[marcelldls]

Weeeeeeell I'd like to say

echo can't connect to camera
exit 1

But for those that choose the path of >1 camera per IOC this would be bad.

So shall we pop in a

echo can't connect to camera ${instance_id}

Thats a fair compromise