request #7457: fix security vulnerability

Prevent bash injection via headers on viewvc

Change-Id: I9002bef7a7c2f645609acb652b710e40de852732
request #7461 SQL injection on docman global search

Change-Id: Ib7e6c9d312ff531834ba0b2fc32ec8e1b1da257d
Tuleap 7.4-4

Change-Id: I10194f2000c1504b5db52d98bec68ea012a2b16b