gpstart: fix OOM issue
gpstart did a cluster-wide check of heap_checksum settings and refused to start the cluster if this setting was inconsistent. This meant a round of ssh'ing across the cluster which was causing OOM errors with large clusters. This commit moves the heap_checksum validation to gpsegstart.py, and changes the logic so that only those segments which have the same heap_checksum setting as master are started. Author: Nadeem Ghani <nghani@pivotal.io> Author: Shoaib Lari <slari@pivotal.io>
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