Remove manual http cookie management

Since docker uses cookiejar it doesn't need to manage cookies manually
anymore.
Managing cookie was duplicating it.

For instance, that's a cookie when pulling an image:
```
Cookie:           __cfduid=d1921af10f2edb413a69c0bb8830897c11394301155651;
                  session=nG4rbvclhv1wuqdMIJBKVcuFpRM=?auth=STAxCi4=&repository=VmxpYnJhcnkvYnVzeWJveApwMAou;
                  __cfduid=d1921af10f2edb413a69c0bb8830897c11394301155651;
                  session=nG4rbvclhv1wuqdMIJBKVcuFpRM=?auth=STAxCi4=&repository=VmxpYnJhcnkvYnVzeWJveApwMAou
```

Fixed to:
```
Cookie:           __cfduid=d837cc573645e506e68ba93a6943872e01394332622482;
                  session=rXRva9xvNqMwPPSLa38NSzGgp0g=?auth=STAxCi4=&repository=VmxpYnJhcnkvY2VudG9zCnAwCi4=
```