fix(bulk): fixing bulk loader when encryption + mtls is enabled

[aman-bansal]

This change is 

[danielmai]

Reviewed 3 of 3 files at r1.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @aman-bansal, @manishrjain, and @vvbalaji-dgraph)

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dgraph/cmd/bulk/reduce.go, line 134 at r1 (raw file):

		x.WorkerConfig.TLSClientConfig = r.opt.ClientTLSConfig

		if !worker.EnterpriseEnabled() {

Can we do this check in run.go instead of waiting until reduce starts? That way we would've caught this issue earlier.

[danielmai]

Reviewed 2 of 3 files at r2.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @aman-bansal, @manishrjain, and @vvbalaji-dgraph)

[danielmai]

Reviewed 1 of 1 files at r3.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @aman-bansal, @manishrjain, and @vvbalaji-dgraph)