bump mysql

[finishes #147786839]

Submodule src/github.com/go-sql-driver/mysql 66312f7f..19845115:
  > Merge remote-tracking branch 'origin/pr/631'
  > Start the watcher after handshake (#627)
  > utils: guard tlsConfigRegister by a lock (#613)
  > Transaction isolation levels (#619)
  > packets: use AppendFormat to format time values (#615)
  > Add atomic wrappers for bool and error (#612)
  > Add support for context.Context (#608)
  > Add missing copyright header (#603)
  > add rejectReadOnly option (to fix AWS Aurora failover) (#604)
  > utils: don't mutate registered tls configs (#600)
  > Avoid allocating on each call to rows.Columns (#444)
  > remove columns definition cache. (#592)
  > infile: fix reading from empty file (#590)
  > travis: submit coverage to coveralls (#589)
  > packets: remove unnecessary conversion from float32 to float32 (#581)
  > packets: replace repeated if/else if by switch (#580)
  > fix typos (#579)
  > travis: check go vet and gofmt (#577)
  > args assigned and not used (#575)
  > Use hostname from DSN as default for TLS if tls=true (#564)
  > Format AUTHORS (#574)
  > doc: fix synopsis for godoc (#567)
  > Fix documentation for timeout parameters (#535)
  > travis: Add MySQL 5.7 and MariaDB tests. (#560)
  > travis: add Go 1.8 test (#557)
  > Add Multi-Results support (#537)
  > Fix many urls (#530)
  > Add author name (#530) (#534)
  > Release v1.3 (#517)
  > Fix old_password authentication via OldAuthSwitchRequest (#524)
  > Move GitHub templates to .github/ (#522)
  > packets: Allow terminating packets of length 0 (#516)
  > rows: Invalidate connection on error in discardResults() (#513)
  > statment: Remove invalid connection error on multiple Close calls (#512)
  > README: document DSN system var quoting rules (#502)
  > Support authentication switch with mysql_native_password authentication (#494)
  > Update CHANGELOG
  > README: Sort variables alphabetically
  > README: Clarify strict mode (#500)
  > Add maxAllowedPacket DSN Parameter
  > README: Include Difference in Connection Strings depending on Cloud SQL Generation
  > add comment
  > fixup
  > Fix index out of range in interpolateParams.
  > Add test to reproduce #467
  > travis.yml: Test with Go 1.7
  > Merge pull request #473 from methane/fix-464
  > Merge pull request #459 from dsnet/master
  > Merge pull request #434 from pib/fix_float_with_placeholder
  > Revert "Merge pull request #350 from dveeden/connattrs_v4"
  > Merge pull request #350 from dveeden/connattrs_v4

Author: jvshahid

.gitmodules

@@ -149,7 +149,7 @@
 	url = https://github.com/pkg/sftp
 [submodule "src/github.com/go-sql-driver/mysql"]
 	path = src/github.com/go-sql-driver/mysql
-	url = https://github.com/go-sql-driver/mysql
+	url = https://github.com/cloudfoundry/mysql
 [submodule "src/github.com/lib/pq"]
 	path = src/github.com/lib/pq
 	url = https://github.com/lib/pq