Go version changed to 1.14.4
Golangci-lint changed to 1.26.0
Bazel version changed to 3.0.0
Bazel rules_go version changed to 0.23.3
Bazel gazelle version changed to v0.21.0
Bazel build tools version changed to 0.25.1
Bazel skylib version changed to 1.0.2
1) github.com/jtblin/go-ldap-client is an abandoned project and not keeping
up with go modules, so pull that code in (single file, BSD license)
2) minor refactor ldap as a result of 1)
3) update go.mod