ASan tests for Travis-CI

Problem is, it's hard to make engine (perl) test to work, because `openssl` binary doing `dlopen` to `gost.so`, which would be built with ASan, and that produces all sorts of weird errors.

Just to note command to build with ASan:
```
cmake -DOPENSSL_ROOT_DIR=...... -DCMAKE_C_FLAGS="-fsanitize=address -fno-omit-frame-pointer -g3"  ..
```
Also for openssl build:
```
./config -d ......
```