update manta maintainers

Change-Id: I5e57c657010c60bc1b1359f883ca1d4f2f851da7
ByTel, update to use recommended APN & fix MMS sending with B&You

* Patch 3: Fix SFR MMS & add SFR Reunion

Change-Id: I2450f317c17a0709e19bbe8e8d9f4352c69e912e
remove leading hypen from extraversion before adding one

Change-Id: Ia33f564d272cae14f300c18d783a108ad09dfef6