Enable functional tests in UBSAN job. Enable -fsanitize=integer (part of UBSAN). Merge UBSAN Travis job with no depends.

contrib/sanitizers-ubsan.suppressions

@@ -0,0 +1,27 @@
+alignment:move.h
+alignment:prevector.h
+bool:wallet/wallet.cpp
+float-divide-by-zero:policy/fees.cpp
+float-divide-by-zero:validation.cpp
+float-divide-by-zero:wallet/wallet.cpp
+nonnull-attribute:support/cleanse.cpp
+unsigned-integer-overflow:basic_string.h
+unsigned-integer-overflow:bench/bench.h
+unsigned-integer-overflow:bloom.cpp
+unsigned-integer-overflow:chain.h
+unsigned-integer-overflow:crypto/chacha20.cpp
+unsigned-integer-overflow:crypto/ctaes/ctaes.c
+unsigned-integer-overflow:crypto/ripemd160.cpp
+unsigned-integer-overflow:crypto/sha1.cpp
+unsigned-integer-overflow:crypto/sha256.cpp
+unsigned-integer-overflow:crypto/sha512.cpp
+unsigned-integer-overflow:hash.cpp
+unsigned-integer-overflow:leveldb/db/log_reader.cc
+unsigned-integer-overflow:leveldb/util/bloom.cc
+unsigned-integer-overflow:leveldb/util/crc32c.h
+unsigned-integer-overflow:leveldb/util/hash.cc
+unsigned-integer-overflow:policy/fees.cpp
+unsigned-integer-overflow:script/interpreter.cpp
+unsigned-integer-overflow:stl_bvector.h
+unsigned-integer-overflow:txmempool.cpp
+unsigned-integer-overflow:validation.cpp