* version 1.0.15
* CI/build/packaging: add Fedora 28
* CI/build/packaging: add Ubuntu Bionic
* CI/build/packaging: remove Fedora 26 (EOL)
* CI/build/packaging: remove Debian Wheezy (EOL)
* fileio: fix GH-229 (--file-fsync-freq=0 seems to prevent
fsync() at the end of the test)
* command line: improve parsing of boolean command line options
* tests: fix GH-220 (Testsuite api_sql_mysql.t failed ...)
* tests: fix GH-223 (test failure on ppc64)
* tests: fix opt_help.t to pass when the binary is not
configured with MySQL support
* MySQL driver: use it by default in DB benchmarks
