tests: fix some http/2 tests for older versions of nghttpx #6139
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Add regex that strips http/2 server header name to those http/2 tests
that don't already have it.
Improve that regex in all http/2 tests.
Tests 358 and 359 were failing for me before this change on a system
that uses an older version of nghttpx which includes its version number
in the server header.
Closes #xxxx
nghttpx has --server-name which would be a better choice to make a uniform server name however it's not available in some older versions that are still supported.