Timeout for OIDC calls to external endpoints

[xwrs]

very minor change to allow passing timeout property to lua-resty-openidc code. no unit tests included

[coveralls]

Pull Request Test Coverage Report for Build 101

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.03%) to 96.0%

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Totals
Change from base Build 99:	0.03%
Covered Lines:	120
Relevant Lines:	125

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💛 - Coveralls

[Trojan295]

Did you check what happens, when a timeout occurs?

[xwrs]

Did you check what happens, when a timeout occurs?

@Trojan295 particularly for token introspection the request is redirected to login page