Merge pull request #35 from ntavares/ipsec-psk-rules

Be explicit in regards to OpenSwan ipsec.secrets rule.According to:
http://linux.die.net/man/5/ipsec.secrets

A preshared secret is most conveniently represented as a sequence of characters, delimited by the double-quote character ("). The sequence cannot contain a newline or double-quote.

* pr/35:
  Be explicit in regards to OpenSwan ipsec.secrets rule.

Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>