[Bug 1782308] Re: channel filters should ignore unknown filter tags

[Andrew Johnson via Core-talk <core-talk at aps.anl.gov>]

** No longer affects: epics-base/3.16

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https://bugs.launchpad.net/bugs/1782308

Title:
  channel filters should ignore unknown filter tags

Status in EPICS Base:
  Triaged
Status in EPICS Base 3.15 series:
  New
Status in EPICS Base 7.0 series:
  Triaged

Bug description:
  At the moment, unknown channel filters cause an error, so that the client cannot connect. In order to be forward compatible with potential new filters in future EPICS versions (in particular in an environment with mixed EPICS versions on different IOCs), the channel filtering should be more relaxed with unknown filters. This is already considered good practice in web applications. For example HTML and CSS ignore unknown tags in order to be "future safe".
  Keep in mind that the client cannot check the EPICS or CA version of the IOC before it connects, and thus cannot know which syntax may be allowed. But using the wrong syntax prevents connection.

  Affects 3.15+. (Conveniently 3.14 simply ignores any filters.)

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