test-suite: eq-ness of numbers, characters is unspecified

test-suite: eq-ness of numbers, characters is unspecified

* test-suite/tests/00-socket.test:
* test-suite/tests/alist.test:
* test-suite/tests/elisp.test:
* test-suite/tests/encoding-iso88591.test:
* test-suite/tests/encoding-iso88597.test:
* test-suite/tests/encoding-utf8.test:
* test-suite/tests/hash.test:
* test-suite/tests/i18n.test:
* test-suite/tests/modules.test:
* test-suite/tests/ports.test:
* test-suite/tests/srfi-35.test: Make tests use eqv? instead of eq? when
  comparing numbers, characters.  Checked also for similar uses of
  assq[-ref].

* test-suite/tests/vlist.test ("vhash-delete honors HASH"): Change test
  to use eqv-ness, not eq-ness, which should not impact its purpose as
  these two are equivalent for strings.