CryptRand: remove newlines from logging message

CryptRand: remove newlines from logging message

5bd6de6 converted CryptRand to use the logger command but kept the
newlines in the message which is needed for wfDebug() but not with the
logger interface.

Patch also removed a call to wfGetAllCallers() from the first debug
message of generate(), leaving an uneeded debugging message.

Hence we had output such as:
---
[CryptRand] Generating cryptographic random bytes for

[CryptRand] mcrypt_create_iv generated 20 bytes of randomness.

[CryptRand] 0 bytes of randomness leftover in the buffer.

---

Drop the newlines from all debug message.
Drop the lonely debug message from generate().

Result:
---
[CryptRand] mcrypt_create_iv generated 20 bytes of randomness.
[CryptRand] 0 bytes of randomness leftover in the buffer.
---

Change-Id: I572206296fc3a0a498febb18925672a67480eb18