contrib: remove unneeded valgrind suppressions

contrib/valgrind.supp

@@ -64,12 +64,6 @@
    ...
    obj:*/libdb_cxx-*.so
 }
-{
-   Suppress leaks on init
-   Memcheck:Leak
-   ...
-   fun:_Z11AppInitMainR11NodeContext
-}
 {
    Suppress leaks on shutdown
    Memcheck:Leak
@@ -82,21 +76,6 @@
    ...
    obj:/usr/lib64/libgdk-3.so.0.2404.7
 }
-{
-   Suppress leveldb warning (leveldb::InitModule()) - https://github.com/google/leveldb/issues/113
-   Memcheck:Leak
-   match-leak-kinds: reachable
-   fun:_Znwm
-   fun:_ZN7leveldbL10InitModuleEv
-}
-{
-   Suppress leveldb warning (leveldb::Env::Default()) - https://github.com/google/leveldb/issues/113
-   Memcheck:Leak
-   match-leak-kinds: reachable
-   fun:_Znwm
-   ...
-   fun:_ZN7leveldbL14InitDefaultEnvEv
-}
 {
    Suppress leveldb leak
    Memcheck:Leak