test-https: turn off system OpenSSL configuration This mostly fixes the test failure on Debian sid where TLS 1.0 and 1.1 are disabled by default. https://sources.debian.org/patches/openssl/1.1.1a-1/Set-systemwide-default-settings-for-libssl-users.patch/ $OPENSSL_CONF could be set by run-tests.py, but the other tests should work without a "legacy" TLS, so I decided to not.

store: move logic to check for invalid entry in fncache to own function This helps separate the original reading logic from the one which finds for an invalid entry. Differential Revision: https://phab.mercurial-scm.org/D6030

py3: add test-phabricator.py to python3-whitelist Differential Revision: https://phab.mercurial-scm.org/D6114

py3: convert to/from bytes/unicode for json.(dump|load)s in debugcallconduit Differential Revision: https://phab.mercurial-scm.org/D6113

py3: use pycompat.byteskwargs on opts in phabricator.py Differential Revision: https://phab.mercurial-scm.org/D6107

watchman: ignore some of watchman errors Don't display 'illegal_fstypes' errors. In environments with network filesystems, the error messages are quickly pilling up and polluting outputs. Differential Revision: https://phab.mercurial-scm.org/D5955

watchman: add the possibility to set the exact watchman binary location This is necessary to make rolling releases of new watchman versions across users. Differential Revision: https://phab.mercurial-scm.org/D5954

context: use wdirhex constant instead of calculating it Differential Revision: https://phab.mercurial-scm.org/D6143