java-1_7_0-openjdk: Three fixes

This update fixes the following issues with java-1_7_0-openjdk:
- bnc#850880: disable bootstrap build
- disable download of tarballs
- bnc#847952: remove cacerts file if it has wrong mime-type

Fixed bugs
bnc#850880
rt.jar provided by java-1_7_0-openjdk is missing the class: sun/net/www/protocol/http/HttpCallerInfo
bnc#847952
installation of jdk fails with java.io.IOException: Invalid keystore format
Selected Binaries
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