obtain a mutex before calling slon_init()

Otherwise the monitorThread and the localListener thread (or another thread)
can call into slon_init() at the same time.

Conflicts:

	RELEASE

Branch
------
master

Details
-------
http://git.postgresql.org/gitweb?p=slony1-engine.git;a=commitdiff;h=663dc7dc36ca6329d50b5f8bc91faac6932e5cb8

Modified Files
--------------
RELEASE |    4 ++++
1 files changed, 4 insertions(+), 0 deletions(-)