Fix bug where transient IMDS failure could revert secondary ip addres…#162
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…ses. Modify subnet calls in create_if_overrides function and add http failure logging.
joeysk2012
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Fixes a bug where if transient IMDS call fails during mid execution of
refresh-policy-routesthen, a the secondary ip configec2_alias.confwill be removed. This happens because there get_imds fails and the shell$(..)will swallow the error and addresses will be returned as a empty string. This could also happen for subnets increate_if_overridesand we do a best effort to fix this as well.Issue #, if available: #161
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