Remove standalone build mode
Before this change, gc-conductor defined its own version of jgit used by
gc-executor. With this change, gc-conductor uses the same jgit version
used by gerrit core, as the only build mode supported is in Gerrit tree.
This removal is possible because Gerrit uses jgit as a submodule since
Therefore, the commands used to build gc-executor are adapted to reflect
how to build gc-executor in Gerrit tree.
LFS plugin had a similar change  and uses the same jgit version as
core's since stable-3.1.
19 files changed