* tests/Makefile.am: Add valgrind-suppressions-ssl to EXTRA_DIST
* tests/Test-proxied-https-auth-keepalive.px: Find valgrind in
correct path during make distcheck
* tests/Test-proxied-https-auth.px: Same
* tests/Test-proxied-https-auth-keepalive.px: Skip test if perl module
IO::Socket::SSL is not installed (trivial change).
* tests/Test-proxied-https-auth.px: Skip test if perl module
IO::Socket::SSL is not installed (trivial change).
* testenv/test/base_test.py: Use Valgrind SSL suppressions file for
tests
* testenv/valgrind-suppression-ssl, tests/valgrind-suppression-ssl:
Add new suppression files to suppress OpenSSL errors in valgrind
* tests/test-proxied-https-auth.px: Use the valgrind SSL
suppressions file for the test
* tests/test-proxied-https-auth-keepalive.px: Same