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

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>
(cherry picked from commit 6df0b9f677984a85cc50fa964c4ead461f0a3063)
Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>