messages: Initializing uninitialized members MMonPaxos

messages: Initializing uninitialized members MMonPaxos

Fixes coverity Issue:

2. uninit_member: Non-static class member epoch is not initialized in this constructor nor in any functions that it calls.
  	4. uninit_member: Non-static class member op is not initialized in this constructor nor in any functions that it calls.
   	6. uninit_member: Non-static class member first_committed is not initialized in this constructor nor in any functions that it calls.
   	8. uninit_member: Non-static class member last_committed is not initialized in this constructor nor in any functions that it calls.
   	10. uninit_member: Non-static class member pn_from is not initialized in this constructor nor in any functions that it calls.
   	12. uninit_member: Non-static class member pn is not initialized in this constructor nor in any functions that it calls.
   	14. uninit_member: Non-static class member uncommitted_pn is not initialized in this constructor nor in any functions that it calls.

CID 717298 (#1 of 1): Uninitialized scalar field (UNINIT_CTOR)
16. uninit_member: Non-static class member latest_version is not initialized in this constructor nor in any functions that it calls.

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