Fix gitignore: ignore only binaries and not whole directories

.gitignore

@@ -7,12 +7,12 @@ install/
 *.so
 *.dylib
 collectagent
-dcdbpusher
-dcdbconfig
-dcdbcsvimport
-dcdbquery
-dcdbquerysum
-dcdbunitconv
+dcdbpusher/dcdbpusher
+tools/dcdbconfig/dcdbconfig
+tools/dcdbcsvimport/dcdbcsvimport
+tools/dcdbquery/dcdbquery
+tools/dcdbquerysum/dcdbquerysum
+tools/dcdbunitconv/dcdbunitconv
 
 ## Ignore various IDE project definition files
 .cproject