Merge remote-tracking branch 'origin/1.6' into 1.7

CMakeLists.txt

debian/changelog

debian/control

rpm/tarantool.spec

test/xlog/suite.cfg

test/xlog/upgrade/1.6.9/00000000000000000000.snap

test/xlog/upgrade/1.6.9/00000000000000000000.xlog

test/xlog/upgrade/1.6.9/00000000000000000005.xlog

test/xlog/upgrade/1.6.9/00000000000000000010.xlog

test/xlog/upgrade/1.6.9/00000000000000000015.xlog

test/xlog/upgrade/1.6.9/00000000000000000020.xlog

test/xlog/upgrade/1.6.9/00000000000000000025.xlog

test/xlog/upgrade/1.6.9/00000000000000000030.xlog

test/xlog/upgrade/1.6.9/version