Paramiko 2.7 introduced new parsing logic for RSA/DSA private keys, and

this logic is far more sensitive to newlines. We previously had our

sample private keys for unit tests formatted with an initial blank line,

and this completely throws off the new parsing. While one may argue

that's something Paramiko should sort out, we're probably not doing the

right thing by having an initial newline.
This change simply gets rid of that newline, providing compatibility

with all versions of Paramiko.

Unit tests pass on Paramiko 2.6 (pre-parser updates) and 2.7.0/2.7.1

(parser updates and parser fixes, respectively).