Don't require c3p0 or H2 drivers

Packing these into our WAR isn't the best idea I've had.  Most
users will be dropping the connection pool into their container
CLASSPATH, and thus the copy within the WAR just takes up disk
space.  Bloating our WAR out makes it take longer to deploy a
new build.

I don't think anyone is actually using H2 with Gerrit right now.
All known deployments are on PostgreSQL.  So embedding the rather
large H2 driver just bloats the WAR even more, without giving us
anything in return.

Taking both of these out of the WAR drops it down by 1.6 MB, which
is a nice reduction in size.

Signed-off-by: Shawn O. Pearce <sop@google.com>
2 files changed