Fix bugzilla bug 238723: Upgrade Bunlde-Version to 2.3.1 in MANIFEST.MF for 2.3.1.
Fix bugzilla bug 238723: Upgrade Bunlde-Version to 2.3.1 in MANIFEST.MF for 2.3.1.

rrimmana/birt-1,rrimmana/birt-1,sguan-actuate/birt,rrimmana/birt-1,Charling-Huang/birt,Charling-Huang/birt,sguan-actuate/birt,Charling-Huang/birt,sguan-actuate/birt,Charling-Huang/birt,rrimmana/birt-1,sguan-actuate/birt,sguan-actuate/birt,Charling-Huang/birt,rrimmana/birt-1