tidb-server: don't bind graceful shutdown to SIGTERM (pingcap#6562) (p…

…ingcap#6569)

SIGTERM is the default kill command signal, it's better to bind it
with normal exit rather than graceful shutdown.

update container builder image to use golang 1.10.1 (pingcap#6410) (p…

…ingcap#6412)

[release-1.0] cherry pick add manual gc (pingcap#6326)

ddl: support the rolling upgrade. (pingcap#6301) (pingcap#6305)

Merge master to 2.0 to release rc5 (pingcap#6288)

plan: statsInfo.count for LogicalTableDual should be its RowCount (pi…

…ngcap#6190)

executor: remove Next function for HashAggExec (pingcap#5987)

executor: remove Next for HashJoinExec (pingcap#5991)

*: move irrelevant code out of package "distsql" (pingcap#5893)

parser: create index support LOCK syntax (pingcap#5851) (pingcap#5853)