client: clean-up objecter on failed client init

During mount() the objecter isn't shutdown if the mon client fails to
initialize. Objecter asserts in destructor expect it to have been
shutdown but this skipped.

hadoop@plana85:~$ ./hadoop/bin/hadoop fs -ls /
14/10/05 12:35:50 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
osdc/Objecter.cc: In function 'virtual Objecter::~Objecter()' thread 7ff422705700 time 2014-10-05 12:35:51.090776
osdc/Objecter.cc: 3927: FAILED assert(!m_request_state_hook)
 ceph version 0.85-981-g25bcc39 (25bcc39bb809e2d13beea1529e4ab92d1b61fa5b)
 1: (ceph::__ceph_assert_fail(char const*, char const*, int, char const*)+0x7f) [0x7ff3f5c28f7f]
 2: (Objecter::~Objecter()+0x397) [0x7ff3f5bca707]
 3: (Objecter::~Objecter()+0x9) [0x7ff3f5bca8b9]
 4: (Client::~Client()+0x7d) [0x7ff3f5b6770d]
 5: (Client::~Client()+0x9) [0x7ff3f5b680a9]
 6: (ceph_mount_info::mount(std::string const&)+0x149) [0x7ff3f5b1fa49]
 7: (ceph_mount()+0x4e) [0x7ff3f5b1dcbe]
 8: (Java_com_ceph_fs_CephMount_native_1ceph_1mount()+0xb7) [0x7ff4158b1c97]
 9: [0x7ff41839dd68]
 NOTE: a copy of the executable, or `objdump -rdS <executable>` is needed to interpret this.
terminate called after throwing an instance of 'ceph::FailedAssertion'
Aborted

fixes: #9663

Signed-off-by: Noah Watkins <noahwatkins@gmail.com>
Merge pull request #2645 from ceph/wip-9663

client: clean-up objecter on failed client init

Reviewed-by: Sage Weil <sage@redhat.com>