Increase client image send timeout from 10s to 10min
Increase client image send timeout from 10s to 10min

(cherry picked from commit 448db65ca39b6f9466c35051c0931c13e261b0b1)

# Conflicts:
#	urbackupclient/ImageThread.cpp

uroni/urbackup_backend,uroni/urbackup_backend,uroni/urbackup_backend,uroni/urbackup_backend,uroni/urbackup_backend,uroni/urbackup_backend,uroni/urbackup_backend