Add ExpTime() to Path interface

[sustrik]

This change is 

[scrye]

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

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go/lib/snet/router.go, line 141 at r1 (raw file):

	// ExpTime returns the expiration time of the path. If the result is zero,
	// expiration time is unknown.
	ExpTime() uint32

uint32 is very awkward to work with, especially because semantics are not clear without digging them up. This should be changed to return time.Time.

[sustrik]

Reviewable status: 0 of 4 files reviewed, 1 unresolved discussion (waiting on @scrye)

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go/lib/snet/router.go, line 141 at r1 (raw file):

Previously, scrye (Sergiu Costea) wrote…

uint32 is very awkward to work with, especially because semantics are not clear without digging them up. This should be changed to return time.Time.

Done.

[scrye]

Reviewed 4 of 4 files at r2.
Reviewable status: complete! all files reviewed, all discussions resolved