saml: Use camelCase api names for SAML login/logout apis

Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>
(cherry picked from commit 85c0bd68ae8a76c231ab402dd0311e3672155f71)
Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>
SAMLUtils: SAML user id should fit within the UUID VARCHAR(40) column

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