scyllatop: coding style fixes
scyllatop: coding style fixes

tools/scyllatop/prometheus.py:3:1: F401 'sys' imported but unused
tools/scyllatop/prometheus.py:7:1: E302 expected 2 blank lines, found 1
tools/scyllatop/prometheus.py:12:5: E301 expected 1 blank line, found 0
tools/scyllatop/prometheus.py:17:1: W293 blank line contains whitespace
tools/scyllatop/prometheus.py:22:82: E225 missing whitespace around operator

Signed-off-by: Alexys Jacob <ee25f2b26a23c85eb2940a5214ecb1801c877d19@gentoo.org>
Message-Id: <20180914110847.1862-1-ee25f2b26a23c85eb2940a5214ecb1801c877d19@gentoo.org>

avikivity/scylla,scylladb/scylla,avikivity/scylla,avikivity/scylla,scylladb/scylla,scylladb/scylla,scylladb/scylla