Ensure all IOCs have a config.xml

[Tom-Willemsen]

As a developer I want to make sure all the IOCs in our system conform to our basic IOC structure and have a config.xml file in the correct place.

Currently build_ioc_startups.py complains:

WARNING: [Errno 2] No such file or directory: 'C:\\Instrument\\Apps\\EPICS\\ioc\\master\\EDNEXT\\iocBoot\\iocEDNEXT-IOC-01\\config.xml'
WARNING: [Errno 2] No such file or directory: 'C:\\Instrument\\Apps\\EPICS\\ioc\\master\\QEPRO\\iocBoot\\iocQEPRO-IOC-01\\config.xml'
WARNING: [Errno 2] No such file or directory: 'C:\\Instrument\\Apps\\EPICS\\ioc\\master\\QEPRO\\iocBoot\\iocQEPRO-IOC-02\\config.xml'
WARNING: [Errno 2] No such file or directory: 'C:\\Instrument\\Apps\\EPICS\\ioc\\master\\SECI2IBEX\\iocBoot\\iocSECI2IBEX-IOC-01\\config.xml'

[mihai-stfc]

ISISComputingGroup/EPICS-ioc#575