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Fix a remote and a local crash scenario #95

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Fix a remote and a local crash scenario #95

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  • Some applications do not start supervisor children (CRITICAL)
  • More safely handle race condition of ETS tables vanishing mid-query

@wschroeder
Some applications do not start supervisor children (CRITICAL)
b850516 
This code filters out children that are not supervisors so we can avoid
crashing remote processes that do not handle the which_children message.

I marked this as critical, as monitoring should not crash remote
systems.
@wschroeder
More safely handle race condition of ETS tables vanishing mid-query
719cbd4 
The time between ets:all/0 and the series of ets:info/1 is enough time
for tables that exist in ets:all/0's output to vanish in systems with
temporary process trees. This code filters out the caught crashes due to
the tables not existing.
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