MEDIUM: proxy: remove start_proxies()

Its sole remaining purpose was to display "proxy foo started", which
has little benefit and pollutes output for those with plenty of proxies.
Let's remove it now.

The VTCs were updated to reflect this, because many of them had explicit
counts of dropped lines to match this message.

This is tagged as MEDIUM because some users may be surprized by the
loss of this quite old message.
diff --git a/reg-tests/checks/1be_40srv_odd_health_checks.vtc b/reg-tests/checks/1be_40srv_odd_health_checks.vtc
index a2a659b..44edfe5 100644
--- a/reg-tests/checks/1be_40srv_odd_health_checks.vtc
+++ b/reg-tests/checks/1be_40srv_odd_health_checks.vtc
@@ -10,10 +10,9 @@
 #EXCLUDE_TARGETS=freebsd
 #REGTEST_TYPE=slow
 
-# Note that the first syslog message received is: "Proxy <name> started."
-syslog S -repeat 21 -level notice {
+syslog S -repeat 20 -level notice {
     recv
-    expect ~ "[^:\\[ ]\\[${h1_pid}\\]: (Health check for server be1/srv([13579]|[123][13579]) succeeded.+reason: Layer4 check passed.+check duration: [[:digit:]]+ms.+status: 1/1 UP|Proxy be1 started.)"
+    expect ~ "[^:\\[ ]\\[${h1_pid}\\]: Health check for server be1/srv([13579]|[123][13579]) succeeded.+reason: Layer4 check passed.+check duration: [[:digit:]]+ms.+status: 1/1 UP"
 } -start
 
 server s0 {} -start