olly 454b106921 Fix freezing playing multi-period DASH with EventStreams
EventSampleStream.readData required eventStreamUpdatable to be
false for END_OF_STREAM to be returned, but it was only being
set to false when the manifest became static. This change also
sets it to false if the period is not the last one in a dynamic
manifest. It also renames it the parameter to appendable, since
that's what it really represents. Events may still be removed
from the start of the EventStream as the period starts moving
out of the live window.

Issue: #4492

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=207517265
2018-08-06 11:38:33 +01:00
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