Submit to SP4 beta

Find address of reference to symbol by its name

Before this patch, the user could only specify
```
 #target_symbol:target_symbol_ref:addr1:addr2
```
however, those address can change when you modify the livepatch
sourcecode. Therefore, we now support:
```
 #target_symbol:target_symbol_ref
```
and now `addr1` and `addr2` will be collected analysing the target
library and livepatch container automatically on packer time.

Signed-off-by: Giuliano Belinassi <gbelinassi@suse.de>