fix(GraphQL): Apply auth rules on type having @dgraph directive

[arijitAD]

Fixes GRAPHQL-525
Fixes #5700

Auth rules were not applied on type having @dgraph directive because they were stored in authRules map corresponding to Graphql type name and was fetched with Dgraph type name when rewriting the query.

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This change is 

[pawanrawal]

I remember you were saying that even the RBAC rules were not working. Can you add a test for that as well?

Reviewed 4 of 4 files at r1.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @arijitAD and @MichaelJCompton)

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graphql/e2e/auth/auth_test.go, line 169 at r1 (raw file):

		Query: `
		mutation {
			addStudent(input : [{email : "` + emails[0] + `"}, {email : "` + emails[1] + `"}]) {

Can you use GraphQL variables here instead of string concatenation? That is usually the correct way to do these things.

[arijitAD]

Added RBAC test,

Reviewable status: 1 of 4 files reviewed, 1 unresolved discussion (waiting on @MichaelJCompton and @pawanrawal)

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graphql/e2e/auth/auth_test.go, line 169 at r1 (raw file):

Previously, pawanrawal (Pawan Rawal) wrote…

Can you use GraphQL variables here instead of string concatenation? That is usually the correct way to do these things.

Done.