doc: updated the copyright years.

api: bumped version to 0.10.12.

doc: we now work with nginx cores as new as 1.13.6.

tests: added full GC cycle operations to avoid false positives in the…

… "check leak" test mode.

bugfix: the ssl connections might be drained and reused prematurely w…

…hen ssl_certificate_by_lua* or ssl_session_fetch_by_lua* were used. this might lead to segmentation faults under load. thanks guanglinlv for the report and the original patch in openresty#1162.

tests: fixed a test case that might fail due to timing errors.

bumped version to 0.10.10.

doc: bumped version to 0.10.9.

Revert "bugfix: ngx.escape_uri: we did not escape URI reserved chars. o…

…penresty#1124"

Commit f170505 breaks the compatibility
with RFC 3986. Here is two reasons:
1. Quote from RFC 3986 Section 2.2:
> A subset of the reserved characters (gen-delims) is used as
delimiters of the generic URI components described in Section 3

Note that RFC 3986 says 'a subset of the reserved characters
(gen-delims)', not all the reserved characters. The characters escaped
in that commit are 'sub-delims'. They are not required to be escaped
according to Section 2.2.

2. Refer to RFC 3986 "Appendix A.  Collected ABNF for URI", sub-delims
could be used as part of query and other components. This use case shows
that sub-delims are valid in some component of URI. Therefore, it would
be better if we don't escape them for URI component.

Signed-off-by: Yichun Zhang (agentzh) <agentzh@gmail.com>

bugfix: ngx.semaphore: when nginx workers exit, the harmless error me…

…ssage "semaphore gc wait queue is not empty" might be logged.

Signed-off-by: Yichun Zhang (agentzh) <agentzh@gmail.com>