parser: bug fix: handle insert row subquery

execution planner did not take into account that a value list
for insert could be a row subquery.
parser: table_expression -> TableExpr
Updated bootstrap to use env-vars.

Bootstrap now performs maven install using environment variables VTROOT, VTTOP and VTDATAROOT.
Keep a persistent Syslog connection.
Merge remote-tracking branch 'youtube/master'
Merge pull request #60 from timofeyb/master

Java vtocc jdbc bootstrap now uses env-vars
Merge branch 'master' of github.com:youtube/vitess
Merge branch 'master' of github.com:youtube/vitess
Merge branch 'parser'
VTTablet: Add tests for codex
VTTablet: remove panics in codex

Remove panics from all functions in codex and return errors instead. To
keep this CL sane allow the callers to panic on error. Eventually we should remove
panics all the way up the stack.