Squish Tests: PV connection behaviour in OPIs

As a developer I would like to verify the following behaviour using Squish:

- Start an IOC and open an OPI used by that IOC.
- Verify that PVs connect in less than 5 seconds.
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- Open an OPI and then start an IOC that uses that OPI.
- Verify that PVs connect in less than 5 seconds. (This will depend on the start-up time of the IOC so choose an IOC that starts relatively quickly)
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- Start an IOC and open an OPI used by that IOC.
- Restart the IOC.
- Verify that PVs connect in less than 5 seconds. (This will depend on the start-up time of the IOC so choose an IOC that starts relatively quickly)
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- Start an IOC and open an OPI used by that IOC.
- Restart the IOC.
- Wait for 2 minutes.
- Verify that PVs connect in less than 60 seconds.
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- Open an OPI.
- Wait 2 minutes.
- Start an IOC that uses that OPI.
- Verify that PVs connect in less than 5 seconds. (This will depend on the start-up time of the IOC so choose an IOC that starts relatively quickly)

Note: this may be a tricky test to implement in a stable way. Consider implementing other (easier) squish testing tickets before this one.