messages,journal: Initialization of stats_period,m_active_set

messages,journal: Initialization of stats_period,m_active_set

Fixes the coverity issues:

** 1396212 Uninitialized scalar field
CID 1396212 (#1 of 1): Uninitialized scalar field (UNINIT_CTOR)
2. uninit_member: Non-static class member stats_period is not
initialized in this constructor nor in any functions that it calls.

** 1396226 Uninitialized scalar field
CID 1396226 (#1 of 1): Uninitialized scalar field (UNINIT_CTOR)
6. uninit_member: Non-static class member m_active_set is not
initialized in this constructor nor in any functions that it calls.

Signed-off-by: Amit Kumar <amitkuma@redhat.com>