debian: Install pinning preference file correctly, and force-yes in install

Signed-off-by: Euan Harris <euan.harris@citrix.com>
Update xapi.1.9.31

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
Merge pull request #282 from djs55/xapi.1.9.31

Update xapi.1.9.31
Bump xapi to 1.9.32

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
Merge pull request #283 from djs55/xapi.1.9.32

Bump xapi to 1.9.32
Update xapi to 1.9.33
debian: Refresh Packages and Sources before trying to install packages

Signed-off-by: Euan Harris <euan.harris@citrix.com>
Merge pull request #284 from euanh/build-improvements

debian: Fix make install target
xapi.1.9.34