ceph: fix valgrind log check

- logs are gzipped; use zgrep
- wait for the proc to exit before looking at stdout

Signed-off-by: Sage Weil <sage@inktank.com>
valgrind: update suppressions for leveldb, libc leaks from mon

These result in clean valgrind leak checks on the mon (at least with my
limited vstart testing).
ceph: fix valgrind grep output parsing

When you pass a single file to zgrep you don't get the filename prefix,
which confuses the split line a few lines down.
valgrind: glibc/boost_thread leak suppressions
valgrind: whitelist all of leveldb
admin_socket: fetch test from correct branch
(cherry picked from commit 3649e2777099054cbfc5bcdb7d0be837d05ebfb3)