Remove test case that downloads from an unreliable server
Remove test case that downloads from an unreliable server

This test case increasingly fails due to transient download failures,
especially from CI actions or other cloud-based infrastructure.

As noted on the linked issue (CODE-110 [1] from 6 Jan 2013), the
issue being tested is not remote file access but rather that this
"recent 1000 genome bam file" contains `@PG-PP` header fields, which
were not recognised by the pysam of the day.

These PP header fields have been accepted since pysam 0.7.3 and are
tested (locally) by AlignmentFileHeader_test.py's TestHeaderWriteRead.
Hence remove this remote test as it is no longer necessary anyway.

[1] https://code.google.com/archive/p/pysam/issues/110

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