Separate FM and xdaq from MASKED_RESOURCES

[kakwok]

Currently, we put FM and xdaq into the same FM parameter: MASKED_RESOURCES, but it is not easy to distinguish FM/xdaq after being mixed up in the parameter afterwards. e.g. Masked FMs should not enter StripExecXml().
It's better to separate the them into different FM parameters.

[jhakala]

One might consider as an alternative making the MASKED_RESOURCES into a more complicated structure, e.g. a MapT<VectorT<StringT>> where we fill the different types of masked resources into a structure like

{"maskedFMs" : ["Level2_HBHEa","Level2_HBHEb"], 
"maskedApps":["hcalSupervisor_0","hcalSupervisor_1"], 
"maskedExecs": ["Executive_0"]}

Also, as it is, the MASK_SUMMARY is basically a list of masked FMs.

I would also note that this is a complicated optimization to do since it requires careful checks of the logic on both the server and GUI sides, and it buys us very little.

[jhakala]

See related discussion at #404.