* Fix wildcard records issue in rout53 plugin
This PR tries to address 4035 where wild card records does not return
correctly in route53 plugin. The issue was that `strings.Index(s, substr string)`
expect substr to be a string but the code defines as char.
This PR fixes 4035.
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
* Fix failed tests
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>