tests: add a test file `--abort` flag while resolving phase-divergence
This patch adds a new test file test-evolve-abort-phasediv.t which will contain
tests for `hg evolve --abort` flag while resolving phase-divergence.
There is a case in this test which does not work right which will be fixed in
upcoming patches.
#!/bin/sh
sleep 5
echo "new desc" >> $1